ARM AMBA NIC-301 Dokumentacja Pobierz pdf (Strona 127)

Programmers Model

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System counter read register descriptions

The following sections describes the system counter read registers.

CNTCVL

The CNTCVL Register characteristics are:

Purpose System counter lower 32 bits read register that enables you to read the

system counter lower 32 bits.

Usage constraints This register is read-only.

Configurations Not applicable.

Attributes See Table 3-56 on page 3-69.

Figure 3-41 shows the bit assignments.

Figure 3-41 System counter CNTCVL Read Register bit assignments

Table 3-57 shows the bit assignments.

CNTCVU

The CNTCVU Register characteristics are:

Purpose System counter upper 32 bits read register that enables you to read the

system counter upper 32 bits.

Usage constraints This register is read-only.

0xFF0

COMPID0 RO

0x0000_000D

32 System counter Component Identification read register 0.

See COMPID0 on page 3-73.

0xFF4

COMPID1 RO

0x0000_00F0

32 System counter Component Identification read register 1.

See COMPID1 on page 3-74.

0xFF8

COMPID2 RO

0x0000_0005

32 System counter Component Identification read register 2.

See COMPID2 on page 3-74.

0xFFC

COMPID3 RO

0x0000_00B1

32 System counter Component Identification read register 3.

See COMPID3 on page 3-75.

Table 3-56 System counter read register summary (continued)

Offset Name Type Test chip reset Width Description

31 0

0 00000 0 000000000000 0000 000000 00

CNTCVL

Table 3-57 System counter CNTCVL Read Register bit assignments

Bits Name Function

[31:0] CNTCVL Current unencoded value of counter lower 32 bits, CNTCV[31:0].

The default is

0x0000_0000

1 2 ... 122 123 124 125 126 127 128 129 130 131 132 ... 177 178

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