參數(shù)資料
型號: STPCI2HEYI
廠商: STMICROELECTRONICS
元件分類: 外設及接口
英文描述: MULTIFUNCTION PERIPHERAL, PBGA516
封裝: PLASTIC, BGA-516
文件頁數(shù): 43/109頁
文件大?。?/td> 2430K
代理商: STPCI2HEYI
STPC ATLAS
Issue 1.1 - March 23, 2004
39/109
3.1.2. STRAP REGISTER 1
This register is read only.
STRAP1
Access = 0022h/0023h
Regoffset =04Bh
76
543210
MD[40]
MD[14]
RSV
MD[36]
This register defaults to the values sampled on the MD pins after reset
Bit Number Sampled
Mnemonic
Description
Bits 7-6
MD[40] & MD[14]
CPU Clock Multiplication (486 mode):
MD14 MD40
10
X 1
11
X 2
All other settings are reserved
HCLK maximum speed is 66MHz and in CPU mode X2.
Operation in X1 mode is only guaranteed up to 66MHz.
Bits 5-1
Rsv
Reserved
Bit 0
MD[36]
These bits reflect the values sampled on MD[36] and determines the
Local Bus Boot device width:
0: 8-bit Boot Device
1: 16-bit Boot Device
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