AM79C975VCW datasheet(108/304 Pages) AMD

108 / 304 page

108

Am79C973/Am79C975

P R E L I M INARY

STOP terminates all network activity abruptly. The host

can use the suspend mode (SPND, CSR5, bit 0) to ter-

minate all network activity in an orderly sequence be-

fore setting the STOP bit.

Power on Reset

Power on Reset (POR) is generated when the

Am79C973/Am79C975 controller is powered up. POR

generates a hardware reset (H_RESET). In addition, it

clears some bits that H_RESET does not affect.

Software Access

PCI Configuration Registers

The Am79C973/Am79C975 controller implements the

256-byte configuration space as defined by the PCI

specification revision 2.1. The 64-byte header includes

all registers required to identify the Am79C973/

Am79C975 controller and its function. Additionally, PCI

Power Management Interface registers are imple-

mented at location 40h - 47h. The layout of the

Am79C973/Am79C975 PCI configuration space is

shown in Table 19.

The PCI configuration registers are accessible only by

configuration cycles. All multi-byte numeric fields follow

little endian byte ordering. All write accesses to Re-

served locations have no effect; reads from these loca-

tions will return a data value of 0.

Table 19. PCI Configuration Space Layout

Offset

Device ID

Vendor ID

00h

Status

Command

04h

Base-Class

Sub-Class

Programming IF

Revision ID

08h

Reserved

Header Type

Latency Timer

Reserved

0Ch

I/O Base Address

10h

Memory Mapped I/O Base Address

14h

Reserved

18h

Reserved

1Ch

Reserved

20h

Reserved

24h

Cardbus CIS Pointer

28h

Subsystem ID

Subsystem Vendor ID

2Ch

Expansion ROM Base Address

30h

Reserved

CAP-PTR

34h

Reserved

38h

MAX_LAT

MIN_GNT

Interrupt Pin

Interrupt Line

3Ch

PMC

NXT_ITM_PTR

CAP_ID

40h

DATA_REG

PMCSR_BSE

PMCSR

44H

Reserved

FCh

AM79C975VCW Datasheet(PDF) 108 Page - Advanced Micro Devices

AM79C975VCW Datasheet(HTML) 108 Page - Advanced Micro Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL