AM79C970AVCW datasheet(95/219 Pages) AMD

95 / 219 page

P R E L I M I N A R Y

AMD

Am79C970A

EEPROM MAP

The automatic EEPROM read operation will access 18

words (i.e. 36 bytes) of the EEPROM. The format of the

EEPROM contents is shown below, beginning with the

byte that resides at the lowest EEPROM address:

Table 12. EEPROM Content

Word

Byte

Address

Addr.

Most Significant Byte

Addr.

Least Significant Byte

00h

01h

Second byte of the ISO 8802-3

00h

First byte of the ISO 8802-3

(Lowest

(IEEE/ANSI 802.3) station physical

EEPROM

address for this node

address for this node, where first byte

address)

refers to the first byte to appear on

the 802.3 medium

01h

03h

Fourth byte of the node address

02h

Third byte of the node address

02h

05h

Sixth byte of the node address

04h

Fifth byte of the node address

03h

07h

Reserved Location: must be 00h

06h

Reserved location must be 00h

04h

09h

Hardware ID: must be 11h if compatibility

08h

Reserved location must be 00h

to AMD drivers is desired

05h

0Bh

User programmable space

0Ah

User programmable space

06h

0Dh

MSByte of two-byte checksum, which is the

0Ch

LSByte of two-byte checksum, which

is the sum of bytes 00h–0Bh and bytes

0Eh and 0Fh

07h

0Fh

Must be ASCII W (57h) if compatibility to

0Eh

Must be ASCII W (57h) if compatibility to

AMD driver software is desired

08h

11h

BCR4[15:8] (Link Status LED)

10h

BCR4[7:0] (Link Status LED)

09h

13h

BCR5[15:8] (LED1 Status)

12h

BCR5[7:0] (LED1 Status)

0Ah

15h

BCR18[15:8] (Burst and Bus Control)

14h

BCR18[7:0] (Burst and Bus Control)

0Bh

17h

BCR2[15:8] (Miscellaneous Configuration)

16h

BCR2[7:0] (Miscellaneous Configuration)

0Ch

19h

BCR6[15:8] (LED2 Status)

18h

BCR6[7:0] (LED2 Status)

0Dh

1Bh

BCR7[15:8] (LED3 Status)

1Ah

BCR7[7:0] (LED3 Status)

0Eh

1Dh

BCR9[15:8] (Full-Duplex Control)

1Ch

BCR9[7:0] (Full-Duplex Control)

0Fh

1Fh

Checksum adjust byte for the first 36 bytes

1Eh

Reserved location must be 00h

of the EEPROM contents, checksum of the

first 36 bytes of the EEPROM should

total to FFh

10h

21h

BCR22[15:8] (PCI Latency)

20h

BCR22[7:0] (PCI Latency)

11h

23h

Reserved location must be 00h

22h

Reserved location must be 00h

Note that the first bit out of any word location in the

EEPROM is treated as the MSB of the register that is be-

ing programmed. For example, the first bit out of

EEPROM word location 08h will be written into BCR4,

bit 15, the second bit out of EEPROM word location 08h

will be written into BCR4, bit 14, etc.

There are two checksum locations within the EEPROM.

The first checksum will be used by AMD driver software

to verify that the ISO 8802-3 (IEEE/ANSI 802.3) station

address has not been corrupted. The value of bytes 0Ch

and 0Dh should match the sum of bytes 00h through

0Bh and 0Eh and 0Fh. The second checksum location

— byte 21h — is not a checksum total, but is, instead, a

checksum adjustment. The value of this byte should be

such that the total checksum for the entire 36 bytes of

EEPROM data equals the value FFh. The checksum

adjust byte is needed by the PCnet-PCI II controller in

order to verify that the EEPROM content has not

been corrupted.

LED Support

The PCnet-PCI II controller can support up to four LEDs.

LED outputs

LNKST, LED1 and LED2 allow for direct

connection of an LED and its supporting pullup device.

LED output

LED3 may require an additional buffer

between the PCnet-PCI II controller output pin and the

LED and its supporting pullup device.

Because the

LED3 output is multiplexed with other

PCnet-PCI II controller functions, it may not always be

possible to connect an LED circuit directly to the

LED3

pin. In applications that want to use the pin to drive an

AM79C970AVCW Arkusz danych(PDF) 95 Page - Advanced Micro Devices

AM79C970AVCW Arkusz danych(HTML) 95 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

Arkusz danych Pobierz

Link URL