參數(shù)資料
型號(hào): 62371AB
廠商: Intel Corp.
英文描述: multi-function PCI device(多功能PCI設(shè)備)
中文描述: 多功能PCI設(shè)備(多功能的PCI設(shè)備)
文件頁(yè)數(shù): 67/284頁(yè)
文件大?。?/td> 1042K
代理商: 62371AB
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E
82371AB (PIIX4)
67
4/9/97 2:23 PM PIIX4aDS
INTEL CONFIDENTIAL
(until publication date)
PRELIMINARY
Bit
Description
1
Positive or Subtractive Decode Configuration.
0=Subtractive Decode (default). 1=Positive
Decode. This bit determines how PIIX4 decodes accesses on the PCI bus for forwarding to ISA.
If set for positive decode, PIIX4 positively decodes (with medium decode timing) and forwards PCI
access to ISA only for address ranges which are enabled within PIIX4. If set for subtractive decode,
PIIX4 positively decodes and forwards those cycles whose addresses are enabled within PIIX4. It
subtractively decodes and forwards all other cycles not positively decoded by another device on the
PCI bus. The setting and functionality of this bit is independent of bit 0, ISA or
EIO Select.
0
ISA or EIO Select.
0=EIO (default). 1=ISA. This bit determines whether the expansion bus on PIIX4
supports the full Industry Standard Architecture (ISA) bus or whether it supports the Extended I/O
(EIO) bus. See the
ISA/EIO Interface
section for details concerning ISA and EIO interface
differences.
This bit also selects the functionality multiplexed onto the IOCHK# and LA[17:23] pins. 0=GPI0 and
GPO[1:7] (default). 1=IOCHK# and LA[17:23] respectively. These are the signals which are not used
in EIO mode.
4.1.20.
RTCCFG—REAL TIME CLOCK CONFIGURATION REGISTER (FUNCTION 0)
Address Offset:
Default Value:
Attribute:
CBh
21h
Read/Write
This register is used to configure the internal Real Time Clock.
Bit
Description
7:6
Reserved.
5
RTC Positive Decode Enable.
0=PIIX4 Subtractively Decodes for RTC I/O registers. 1=PIIX4
Positively Decodes for RTC I/O registers (default). The PCI cycles with addresses 70–73h are either
positively or subtractively decoded based on this bit. The cycles are then routed to the internal RTC
controller or forwarded to ISA based on bits 2 (extended bank) and bit 0 (standard bank) below.
This bit should be set to 0 if PIIX4’s internal RTC is not used and the external RTC is on the
PCI bus, or if subtractive decode is desired for an external RTC on the ISA or X-Bus.
4
Lock Upper RAM Bytes.
0=Upper RAM data bytes 38h–3Fh in the extended bank are readable and
writeable (default). 1=Upper RAM data bytes 38h–3Fh in the extended bank are neither readable nor
writeable. This is used to lock bytes 38h–3Fh in the upper 128-byte bank of RAM. Write cycles will
have no effect and read cycles will not return a guaranteed value.
Warning:
This is a write-once register that can only be reset by a hardware reset. No software
means is possible to reset this bit.
3
Lock Lower RAM Bytes.
0=Lower RAM data bytes 38h–3Fh in the standard bank are readable and
writeable (default). 1=Lower RAM data bytes 38h–3Fh in the standard bank are neither readable nor
writeable. This is used to lock bytes 38h–3Fh in the lower 128-byte bank of RAM. Write cycles will
have no effect and read cycles will not return a guaranteed value.
Warning:
This is a write-once register that can only be reset by a hardware reset. No software
means is possible to reset this bit.
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