ARM AMBA NIC-301 Spezifikationen PDF herunterladen (Seite 133)

Programmers Model

ID062813 Non-Confidential

You can use the system timer to implement watchdog functionality. You can only use this

functionality to generate a generic timer interrupt to the GIC-400, interrupt 131. You cannot use

it to implement a reset request capability.

System timer register summary

Table 3-68 shows the counter system control registers and corresponding offsets from the

system counter base memory address.

Table 3-68 System timer control register summary

Offset Name Type Test chip reset Width Description

0x00

CNTLPCT RO Not applicable 32 System timer physical count lower 32 bits.

See CNTLPCT on page 3-77.

0x04

CNTUPCT RO Not applicable 32 System timer physical count upper 32 bits.

See CNTUPCT on page 3-78.

0x08

CNTLVCT RW Not applicable 32 Virtual count lower 32 bits, physical count, virtual offset.

See CNTLVCT on page 3-78.

0x0C

CNTUVCT RW Not applicable 32 Virtual count upper 32 bits, physical count, virtual offset

See CNTUVCT on page 3-78.

0x10

CNTFRQ RW Not applicable 32 Denotes the number of clock ticks per second, R0 from

second ‘user’ view when access is enabled.

See CNTFRQ on page 3-79

0x14

CNTPL0ACR RW

0x0000_0000

32 Second view access control, visible only in the first ‘kernel’

view.

See CNTPL0ACR on page 3-79.

0x18

CNTLVOFF RO Not applicable 32 Read-only version of the virtual offset lower 32 bits from

the system timer control block CNTFOFF[31:0], visible

only in the first ‘kernel’ view.

See CNTLVOFF on page 3-80.

0x1C

CNTUVOFF RO Not applicable 32 Read-only version of the virtual offset upper 32 bits from

the system timer control block CNTFOFF[31:0], visible

only in the first ‘kernel’ view.

See CNTUVOFF on page 3-80.

0x20

CNTPL_CVAL RW

0x0000_0000

32 System timer lower 32 bits comparison value.

See CNTPL_CVAL on page 3-80.

0x24

CNTPU_CVAL RW

0x0000_0000

32 System timer upper 32 bits comparison value.

See CNTPU_CVAL on page 3-81.

0x28

CNTP_TVAL RW

0x0000_0000

32 System timer value.

See CNTP_TVAL on page 3-81.

0x2C

CNTP_CTL RW

0x0000_0000

32 System timer control register.

See CNTP_CTL on page 3-82.

0x30

CNTVL_CVAL RW

0x0000_0000

32 Virtual timer lower 32 bits comparison value.

See CNTVL_CVAL on page 3-83.

0x34

CNTVU_CVAL RW

0x0000_0000

32 Virtual timer upper 32 bits comparison value.

See CNTVU_CVAL on page 3-83.

1 2 ... 128 129 130 131 132 133 134 135 136 137 138 ... 177 178

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