SocLib Components General Index

VciXicu

1) Functional Description

This VCI target is a memory mapped peripheral implementing a vectorized interrupt controller, a timer controller, and an Inter-processor interrupt controller: It is an interrupt hub, concentrating 3 types of interrupts:

• up to 32 internal programmable timer interrupts (PTI),
• up to 32 external hardware interrupt lines (HWI),
• up to 32 internal write-triggered interrupts (WTI).

All these interrupt sources can be routed to up to 32 interrupt outputs. Each output can mask individual interrupt sources. Priority between interrupt source types is left to the handling operating system. Priority of interrupts inside an interrupt source type is from the lowest index(highest priority) to the highest index (lower priority).

1.1) Constructor Parameters

All hardware implementations of this component may not implement all the up-to-32 PTI (Timers), up-to-32 HWI lines, up-to-32 WTI registers and up-to-32 OUTPUTlines. The following parameters allow the system designer to get just the needed hardware.

• pti count (in range 0..32): number of programmable timers
• hwi count (in range 0..32): number of external hardware interrupt lines
• wti count (in range 0..32): number of write-triggered interrupt sources
• irqcount (in range 1..32): number of output interrupt lines

1.2) Programmers's View

This component can be mapped anywhere in the address space, on a 4-KBytes boundary. This component is 32-bit data-word based: arbitrary byte access is not supported. The 12 lower address lines are used the following way:

FUNC	INDEX	00
5 bits	5bits

• FUNC indicates the functionnality
• IDX depending on the functionnality, this can be either an input index, or an output index in the range 0...31

MODE	Register	FUNC	INDEX
R/W	WTI_REG	00000	WTI_INDEX
R/W	PTI_PER	00001	PTI_INDEX
R/W	PTI_VAL	00010	PTI_INDEX
W	PTI_ACK	00011	PTI_INDEX
R/W	MSK_PTI	00100	0UT_INDEX
W	MSK_PTI_ENABLE	00101	OUT_INDEX
W	MSK_PTI_DISABLE	00110	OUT_INDEX
R	PTI_ACTIVE	00110	OUT_INDEX
	Reserved	00111
R/W	MSK_HWI	01000	OUT_INDEX
W	MSK_HWI_ENABLE	01001	OUT_INDEX
W	MSK_HWI_DISABLE	01010	OUT_INDEX
R	HWI_ACTIVE	01010	OUT_INDEX
	Reserved	01111
R/W	MSK_WTI	01100	OUT_INDEX
W	MSK_WTI_ENABLE	01101	OUT_INDEX
W	MSK_WTI_DISABLE	01110	OUT_INDEX
R	WTI_ACTIVE	01110	OUT_INDEX
R	PRIO	01111	OUT_INDEX
	Reserved	1----

WTI_REG[WTI_INDEX] : Write-Triggered Interrupt Register

This register retains the value written. It can be used as a mailbox between the software interrupt source and the target if here is only one source. In case of several sources, two different sources may write sequentially to this register, overwriting the value present in register.

• On write : Raises WTI[WTI_INDEX]
• On read : Acknowledges WTI[WTI_INDEX]

PTI_PER[PTI_INDEX] : Programmable Timer Period Register

This register contains the reset value for TIMER[PTI_INDEX] when it wraps to 0. If this register is set to 0, the corresponding timer is disabled and no interrupt is ever raised. Setting this register to 0 when there is a pending interrupt clears it without need to read PTI_ACK[PTI_INDEX].

• On write : Resets the period of TIMER[PTI_INDEX]. If the timer is currently running, the corresponding timer counter is not reset.
• On read : Gets the period of TIMER[PTI_INDEX].

PTI_VAL[PTI_INDEX] : Programmable Timer Value Register

This register is decremented by 1 on each clock's raising edge. When it gets to 0, the value is reset to the corresponding period register value (PTI_PER[PTI–INDEX]), and the corresponding timer interrupt line is asserted until acknowledged. Decrementation goes on whether interrupt is acknowledged or not.

• On write : Resets the current value of TIMER[PTI_INDEX]. Writing a value greater than PTI_PER[PTI_INDEX] in this register has no particular side-effect: value will normally decrement to 0 and then be reset to PTI_PER[PTI_INDEX] when wrapping.
• On read : Gets the current value of TIMER[PTI_INDEX].

PTI_ACK[PTI_INDEX] : Programmable Timer Acknowledge Register

This register is used by the software to deassert an interrupt raised by wrapping of the PTI_VAL[PTI_INDEX] register.

• On write : Unsupported
• On read : Acknowledges the interrupt associated to TIMER[PTI_INDEX]. Read value has no useful meaning.

MSK_PTI[OUT_INDEX] : Programmable Timer Mask for IRQ[OUT_INDEX]

Each bit in this register is a mask for the corresponding timer IRQ. A 1 in bit x enables the timer x as an interrupt source for IRQ[OUT_INDEX].

• On write : Sets the current mask
• On read : Gets the current mask

MSK_PTI_ENABLE[OUT_INDEX] : Programmable Timer Mask Enabler for IRQ[OUT_INDEX]

Each bit written here unmasks the corresponding timer IRQ. Writing a 1 in bit x enables the timer x as an interrupt source for IRQ[OUT_INDEX].

• On write : ORs MSK_PTI[OUT_INDEX] with the written value.
• On read : Unsupported

MSK_PTI_DISABLE[OUT_INDEX] : Programmable Timer Mask Disabler for IRQ[OUT_INDEX]

Each bit written here masks the corresponding timer IRQ. Writing a 1 in bit x disables the timer x as an interrupt source for IRQ[OUT_INDEX].

• On write : ANDs MSK_PTI[OUT_INDEX] with the complement of the written value.
• On read : Unsupported

PTI_ACTIVE[OUT_INDEX] : Current Unmasked Timer IRQs for IRQ[OUT_INDEX]

Each bit read here corresponds to an active and unmasked timer IRQ, according to current global timer status and MSK_PTI[OUT_INDEX].

• On write : Unsupported
• On read : Gets the current timer status for IRQ[OUT_INDEX].

MSK_HWI[OUT_INDEX] : Hardware Interrupts Mask for IRQ[OUT_INDEX]

Each bit in this register is a mask for the corresponding hardware interrupt. A 1 in bit x enables the hardware interrupt x as an interrupt source for IRQ[OUT_INDEX].

• On write : Sets the current mask
• On read : Gets the current mask

MSK_HWI_ENABLE[OUT_INDEX] : Hardware Interrupt Mask Enabler for IRQ[OUT_INDEX]

Each bit written here unmasks the corresponding hardware interrupt. Writing a 1 in bit x enables the hardware interrupt x as an interrupt source for IRQ[OUT_INDEX].

• On write : ORs MSK_PTI[OUT_INDEX] with the written value.
• On read : Unsupported

MSK_HWI_DISABLE[OUT_INDEX] : Hardware Interrupt Mask Disabler for IRQ[OUT_INDEX]

Each bit written here masks the corresponding hardware interrupt. Writing a 1 in bit x disables the hardware interrupt x as an interrupt source for IRQ[OUT_INDEX].

• On write : ANDs MSK_PTI[OUT_INDEX] with the complement of the written value.
• On read : Unsupported

HWI_ACTIVE[OUT_INDEX] : Current Unmasked Hardware Interrupts for IRQ[OUT_INDEX]

Each bit read here corresponds to an active and unmasked hardware interrupt, according to current global hardware interrupt status and MSK_HWI[OUT_INDEX].

• On write : Unsupported
• On read : Gets the current hardware interrupts status for IRQ[OUT_INDEX].

MSK_WTI[OUT_INDEX] : Write-Triggered Interrupts Mask for IRQ[OUT_INDEX]

Each bit in this register is a mask for the corresponding software interrupt. A 1 in bit x enables the software interrupt x as an interrupt source for IRQ[OUT_INDEX].

• On write : Sets the current mask
• On read : Gets the current mask

MSK_WTI_ENABLE[OUT_INDEX] : Write-Triggered Interrupt Mask Enabler for IRQ[OUT_INDEX]

Each bit written here unmasks the corresponding software interrupt. Writing a 1 in bit x enables the software interrupt x as an interrupt source for IRQ[OUT_INDEX].

• On write : ORs MSK_PTI[OUT_INDEX] with the written value.
• On read : Unsupported

MSK_WTI_DISABLE[OUT_INDEX] : Write-Triggered Interrupt Mask Disabler for IRQ[OUT_INDEX]

Each bit written here masks the corresponding software interrupt. Writing a 1 in bit x disables the software interrupt x as an interrupt source for IRQ[OUT_INDEX].

• On write : ANDs MSK_PTI[OUT_INDEX] with the complement of the written value.
• On read : Unsupported

WTI_ACTIVE[OUT_INDEX] : Current Unmasked Write-Triggered Interrupts for IRQ[OUT_INDEX]

Each bit read here corresponds to an active and unmasked software interrupt, according to current global software interrupt status and MSK_WTI[OUT_INDEX].

• On write : Unsupported
• On read : Gets the current software interrupts status for IRQ[OUT_INDEX].

PRIO[OUT_INDEX] : Priority Encoder for IRQ[OUT_INDEX]

This register holds the index of the highest priority, active and unmasked interrupt for each source type.

• On write : Unsupported
• On read : Get the three highest-priority active interrupt indexes for IRQ[OUT_INDEX].

000

PRIO_WTI

000

PRIO_HWI

000

PRIO_PTI

00000

W

H

T

• Bit T is set if there is at least one unmasked timer interrupt.
• Bit H is set if there is at least one unmasked hardware interrupt.
• Bit W is set if there is at least one unmasked software interrupt.
• Field PRIO_PTI (5 bits) contains the index of the highest priority timer interrupt.
• Field PRIO_HWI (5 bits) contains the index of the highest priority hardware interrupt.
• Field PRIO_WTI (5 bits) contains the index of the highest priority software interrupt.

Complete specification is in xicu-1.0.pdf​.

2) Component definition & usage

source:trunk/soclib/module/infrastructure_component/interrupt_infrastructure/vci_xicu/caba/metadata/vci_xicu.sd

Uses( 'vci_xicu' )

3) CABA Implementation

CABA sources

• interface : source:trunk/soclib/soclib/module/infrastructure_component/interrupt_infrastructure/vci_xicu/caba/source/include/vci_xicu.h​
• implementation : source:trunk/soclib/soclib/module/infrastructure_component/interrupt_infrastructure/vci_xicu/caba/source/src/vci_xicu.cpp​

CABA Constructor parameters

VciXicu(
     sc_module_name name,  // Component Name
     const soclib::common::InTab &index, // Target index
     const soclib::common::MappingTable &mt,  // Mapping Table
     size_t pti_count,   // Number of programmeble timers
     size_t hwi_count,   // Number of hardware interrupt lines
     size_t wti_count,   // Number of write-triggerred interrupts (IPI)
     size_t irq_count);  // Number of output lines

CABA Ports

• sc_in<bool> p_clk : Global system clock
• sc_in<bool> p_resetn : Global system reset
• soclib::caba::VciTarget<vci_param> p_vci : VCI port
• sc_out<bool> *p_irq : Output interrupt ports (irq_count)
• sc_in<bool> *p_hwi : Input interrupts ports (hwi_count)

4) TLM-DT Implementation

TLM-DT sources

• interface : source:trunk/soclib/soclib/module/infrastructure_component/interrupt_infrastructure/vci_xicu/tlmdt/source/include/vci_xicu.h​
• implementation : source:trunk/soclib/soclib/module/infrastructure_component/interrupt_infrastructure/vci_xicu/tlmdt/source/src/vci_xicu.cpp​

TLM-DT Constructor parameters

VciXicu(
     sc_module_name name,  // Component Name
     const soclib::common::InTab &index, // Target index
     const soclib::common::MappingTable &mt,  // Mapping Table
     size_t pti_count,   // Number of programmeble timers
     size_t hwi_count,   // Number of hardware interrupt lines
     size_t wti_count,   // Number of write-triggerred interrupts (IPI)
     size_t irq_count);  // Number of output lines

TLM-DT Ports

• p_vci : VCI target port
• p_irq[irq_count] : Output interrupt ports
• p_hwi[hwi_count] : Input interrupts ports