參數(shù)資料
型號(hào)： AM79C974
廠商： Advanced Micro Devices, Inc.
英文描述： PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
中文描述： PCnetTM -的SCSI結(jié)合以太網(wǎng)和SCSI控制器PCI系統(tǒng)
文件頁數(shù)： 65/153頁
文件大?。?/td> 838K
代理商： AM79C974
P R E L I M I N A R Y
AMD
65
Am79C974
Note that when I/O resource width is defined as 32 bits
(DWIO mode), the upper 16 bits of the I/O resource is
reserved and written as ZEROS and read as undefined,
except for the APROM locations and CSR88.The
APROM locations and CSR88 are the only I/O re-
sources for which all 32 bits will have defined values.
However, this is true only when the Am79C974 control-
ler is in DWIO mode.
Configuring the Am79C974 controller for DWIO mode is
accomplished whenever there is any attempt to perform
a 32-bit write access to the RDP location (offset 10h).
See the DWIO section for more details.
Table 4 describes all possible bus slave accesses that
may be directed toward the Am79C974 controller. (i.e.,
the Am79C974 controller is the target device during the
transfer.) The first column indicates the type of slave ac-
cess. RD stands for READ, WR for a WRITE operation.
The second column indicates the value of the C/
BE
[3:0]
lines during the data phase of the transfer. The four byte
columns (AD[31:24], AD[23:16], AD[15:8], AD[7:0]) in-
dicate the value on the address/data bus during the data
phase of the access. “data” indicates the position of the
active bytes; “copy” indicates the positions of copies of
the active bytes; “undef” indicates byte locations that are
undefined during the transfer.
Table 4. Bus Slave Accesses
AD
AD
AD
[15:8]
AD
[7:0]
TYPE
BE
[3:0]
[31:24]
[23:16]
Comments
RD
0000
data
data
data
data
DWORD access to DWORD address, e.g. 300h,
30Ch, 310h (DWIO mode only)
RD
1100
undef
undef
data
data
word access to even word address, e.g. 300h,
30Ch, 310h (WIO mode only)
RD
0011
data
data
copy
copy
word access to odd word address, e.g. 302h, 30Eh,
312h (WIO mode only)
RD
1110
undef
undef
undef
data
byte access to lower byte of even word address, e.g.
300h, 304h (WIO mode only, APROM accesses
only)
RD
1101
undef
undef
data
undef
byte access to upper byte of even word address,
e.g. 301h, 305h (WIO mode only, APROM accesses
only)
RD
1011
undef
data
undef
copy
byte access to lower byte of odd word address, e.g.
302h, 306h (WIO mode only, APROM accesses
only)
RD
0111
data
undef
copy
undef
byte access to upper byte of odd word address, e.g.
303h, 307h (WIO mode only, APROM accesses
only)
WR
0000
data
data
data
data
DWORD access to DWORD address, e.g. 300h,
30Ch, 310h (DWIO mode only)
WR
1100
undef
undef
data
data
word access to even word address, e.g. 300h,
30Ch, 310h (WIO mode only)
WR
0011
data
data
undef
undef
word access to odd word address, e.g. 302h, 30Eh,
312h (WIO mode only)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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