AM79C974 datasheet(136/153 Pages) AMD

136 / 153 page

AMD

A M E N D M E N T

Am79C974

Page 19

(Reprinted as page 9 of this amendment)

PIN DESCRIPTION,

GNTA

Add after the second paragraph:

The Am79C974 supports bus parking. When the PCI bus is idle and the system arbiter asserts

GNTA without an active

REQA from the Am79C974 controller, the Am79C794 will actively drive the AD[31:00], C/BE[3:0], and PAR lines.

Page 20

Note that

INTA and INTB are both open drain pins.

Page 24

Note that

ATN is open drain.

Page 25

The number of each type of power pin is incorrect. The numbers should be:

—VDD/DVDD, Digital Power, 5 pins

—VDDB/VDDBS, I/O Buffer Power, 5 pins

—VSS/DVSS Digital Ground, 9 pins

—VSSB/VSSBS, I/O Buffer Ground, 11 pins

Page 30

The second sentence should read, “It is a single cycle, non-burst 8-bit, 16-bit, or 32-bit transfer which is initiated by the

host CPU.” (The original omitted “8-bit”).

Page 32

(Reprinted as page 10 of this amendment)

In Figure 6, data on the AD lines should be driven during clock 6 and the second instance of PAR should be driven

during clock 7. In each case this is one cycle earlier than what is shown in the figure.

Page 35

Line 2, change “type 15” to “type 14”.

Page 39

(Reprinted as page 11 of this amendment)

Replace the last two sentences with the following:

“For SCSI, when target aborts,

INTA will not be asserted, but the ABORT bit (bit 2 of the DMA status register at offset

54h) is set. For either Ethernet or SCSI a target abort causes RTABORT (bit 12) of the status register in the appropriate

PCI configuration space to be set.” (The original stated that

INTA will be asserted.)

Page 42

(Reprinted as page 12 of this amendment)

Replace the last sentence with the following:

“For SCSI, when the master aborts,

INTA will not be asserted, but the ABORT bit (bit 2 of the DMA status register at

offset 54h) is set. For either Ethernet or SCSI a master abort causes RMABORT (bit 13) of the status register in the

appropriate PCI configuration space to be set.” (The original stated that

INTA will be asserted.)

AM79C974 Datasheet(PDF) 136 Page - Advanced Micro Devices

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