參數(shù)資料
型號: STPC12HEYC
廠商: 意法半導(dǎo)體
英文描述: X86 Core PC Compatible System-on-Chip for Terminals
中文描述: x86內(nèi)核PC兼容系統(tǒng)上的終端芯片
文件頁數(shù): 35/111頁
文件大?。?/td> 1896K
代理商: STPC12HEYC
STRAP OPTION
Issue 1.0
- July 24, 2002
35/
111
3.1. STRAP OPTION REGISTER DESCRIPTION
3.1.1. STRAP REGISTER 0
This register is read only.
STRAP0
Access = 0022h/0023h
Regoffset =04Ah
7
6
5
4
3
2
1
0
MD[7]
MD[6]
MD[9]
MD[8]
RSV
MD[5]
MD[4]
MD[17]
This register defaults to the values sampled on the MD pins after reset
Bit Number Sampled
Mnemonic
Description
Bits 7-6
MD[7:6]
PCICLK PLL set-up: The value sampled on MD[7:6] controls the PCICLK
PLL programming according to the PCICLK frequency.
MD7 MD6
0
0
PCICLK frequency between 16 & 32 MHz
0
1
PCICLK frequency between 32 & 64 MHz
1
X
Reserved
Bits 5-4
MD[9:8]
Mode selection:
MD9 MD8
0
0 ISA mode: ISA enabled, PCMCIA & Local Bus disabled
0
1 PCMCIA mode: PCMCIA enabled, ISA & Local Bus disabled
1
0 Local Bus mode: Local Bus enabled, ISA & PCMCIA disabled
1
1 Reserved
Bit 3
Rsv
Reserved
Bit 2
MD[5]
Host Memory synchronization. This bit reflects the value sampled on
[MD5] and controls the MCLK/HCLK synchronization.
0: MCLK and HCLK not synchronized
1: MCLK and HCLK synchronized.
Bits 1-0
MD[4], MD[17]
PCICLK division: These bits reflect the values sampled on [MD4] and
MD[17] to select the PCICLK frequency.
MD4 MD17
0
X
PCI Clock output = HCLK / 4
1
0
PCI Clock output = HCLK / 3
1
1
PCI Clock output = HCLK / 2
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