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| 型號(hào)： | AM79C965KCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 3 CHANNEL(S), LOCAL AREA NETWORK CONTROLLER, PQFP16 |
| 封裝： | PLASTIC, QFP-160 |
| 文件頁(yè)數(shù)： | 6/220頁(yè) |
| 文件大小： | 1197K |
| 代理商： | AM79C965KCW |
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P R E L I M I N A R Y
AMD
103
Am79C965
Software Access
I/O Resources
PCnet-32 Controller I/O Resource Mapping
The PCnet-32 controller has several I/O resources.
These resources use 32 bytes of I/O space that begin at
the PCnet-32 controller I/O Base Address.
The PCnet-32 controller allows two modes of slave ac-
cess. Word I/O mode treats all PCnet-32 controller I/O
Resources as two-byte entities spaced at two-byte ad-
dress intervals. Double Word I/O mode treats all
PCnet-32 controller I/O Resources as four-byte entities
spaced at four-byte address intervals. The selection
of WIO or DWIO mode is accomplished by one of
two ways:
1) H_RESET function.
The PCnet-32 controller I/O mode setting will default
to WIO after H_RESET (i.e. DWIO =0).
2) Automatic determination of DWIO mode due to
doubleword I/O write access to offset 10h.
DWIO is automatically programmed as active when the
system attempts a double word write access to offset
10h of the PCnet-32 controller I/O space. Note that this
space corresponds to RDP, regardless of whether
DWIO or WIO mode has been programmed. The power
up H_RESET value of DWIO will be ZERO, and this
value will be maintained until a double word access is
performed to PCnet-32 controller I/O space.
Therefore, if DWIO mode is desired, it is imperative that
the first access to the PCnet-32 controller be a double
word write access to offset 10h.
Alternatively, if DWIO mode is not desired, then it is im-
perative that the software never executes a double word
write access to offset 10h of the PCnet-32 controller I/O
space.
Once the DWIO bit has been set to a ONE, only a
H_RESET can reset it to a ZERO.
The DWIO mode setting is unaffected by S_RESET or
the STOP bit.
WIO I/O Resource Map
When the PCnet-32 controller I/O space is mapped as
Word I/O, then the resources that are allotted to the
PCnet-32 controller occur on word boundaries that are
offset from the PCnet-32 controller I/O Base Address as
shown in Table 32.
Table 32. Word I/O Mapping
Offset
No. of
(Hex)
Bytes
Register
0
2
Address PROM
2
Address PROM
4
2
Address PROM
6
2
Address PROM
8
2
Address PROM
A
2
Address PROM
C
2
Address PROM
E
2
Address PROM
10
2
RDP
12
2
RAP (shared by RDP and BDP)
14
2
Reset Register
16
2
BDP
18
2
Vendor Specific Word
1A
2
Reserved
1C
2
Reserved
1E
2
Reserved
When PCnet-32 controller I/O space is Word mapped,
all I/O resources fall on word boundaries and all I/O re-
sources are word quantities. However, while in Word I/O
mode, address PROM accesses may also be accessed
as individual bytes on byte addresses.
Attempts to write to any PCnet-32 controller I/O re-
sources (except to offset 10h, RDP) as 32 bit
quantities while in Word I/O mode are illegal and may
cause unexpected reprogramming of the PCnet-32 con-
troller control registers. Attempts to read
from any
PCnet-32 controller I/O resources as 32 bit quantities
while in Word I/O mode are illegal and will yield
undefined values.
An attempt to
write to offset 10H (RDP) as a 32 bit quan-
tity while in Word I/O mode will cause the PCnet-32 con-
troller to exit WIO mode and immediately thereafter, to
enter DWIO mode.
Accesses to non-word address boundaries are not al-
lowed while in WIO mode, with the exception of the
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