AM79C976 datasheet(150/309 Pages) AMD

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150

Am79C976

8/01/00

P R E L I M INARY

FLASH_ADDR: Flash Address Register

Offset 198h

The contents of this register are cleared to 0 when the

RST pin is asserted. The register is not cleared at the

start of a serial EEPROM read operation or after a se-

rial EEPROM read error.

Table 55. FLASH_ADDR: Flash Address Register

)/$6+B'$7$ )ODVK'DWD 5HJLVWHU

Offset 19Ch

The contents of this register are cleared to 0 when the

RST pin is asserted. The register is not cleared at the

start of a serial EEPROM read operation or after a se-

rial EEPROM read error.

This register is an alias of BCR30.

Table 56. FLASH_DATA: Flash Data Register

Bit

Name

Description

LAAINC

Lower Address Auto Increment. When the LAAINC bit is set to 1, the low-order 16-bit portion of the

Flash Address Register will automatically increment by one after a read or write access to the Flash

Data Register. When the low-order 16-bit portion of the Flash Address reaches FFFFh and

LAAINC is set to 1, the low-order 16-bit portion of the Flash Address will roll over to 0000h. When

the LAAINC bit is set to 0, the Flash Address Register will not be affected in any way after an

access to the Flash Data Register.

This bit is an alias of BCR29, bit 14.

30-24

RES

Reserved locations. Written as zeros and read as undefined.

23-0

FLASH_

ADDR

Flash Address. This field selects the byte of the external Flash/ROM device that will be accessed

when the Flash Data Register is accessed.

This field is an alias of BCR29, bits [7:0] concatenated with BCR28, bits [15:0].

Bit

Name

Description

15-8

RES

Reserved locations. Written as zeros and read as undefined.

7-0

FLASH_DATA

Flash Data. This field contains data written to or read from the external Flash/ROM device. When

the host CPU writes to this register, the contents of this field are written to the external Flash device

at the location selected by the Flash Address Register. When the host CPU reads this register, the

Am79C976 device first reads the location in the Flash device selected by the Flash Address

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