参数资料
型号: STPCE1EEBC
厂商: STMICROELECTRONICS
元件分类: 外设及接口
英文描述: MULTIFUNCTION PERIPHERAL, PBGA388
封装: PLASTIC, BGA-388
文件页数: 21/87页
文件大小: 1426K
代理商: STPCE1EEBC
Obsolete
Product(s)
- Obsolete
Product(s)
STRAP OPTION
28/87
Release 1.3 - January 29, 2002
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
3.1. POWER ON STRAP REGISTER DESCRIPTIONS
3.1.1. STRAP REGISTER 0 CONFIGURATION
Strap0
Access = 0022h/0023h
Regoffset = 04Ah
76543210
MD7
MD6
MD5
MD4
MD3
MD2
Rsv
This register defaults to the values sampled on MD[7:0] pins after reset
Bit Number Sampled
Mnemonic
Description
Bits 7-6
MD[7:6]
PCICLK Programming; the PCICLK PLL is setup through
MD[7:6]. The PLL setup will vary depending on the PCICLK
frequency. See Table 3-2 for details.
Bit 5
MD5
This bit reflects the value sampled on MD[5] pin and controls the MCLK/
HCLK Synchronization. When MCLK and HCLK frequency are the same,
when set to 1 it unifies HCLK and MCLK and so improves system
performance.
Bit 4
MD4
This bit reflects the value sampled on MD[4] pin and controls the
PCICLKO division. It works in conjunction with MD[17]; refer to Section
3.1.3. bit 1 for more details.
Bits 3-2
MD[3:2]
See Section 3.1.4.
Bits 1-0
Rsv
Reserved.
Table 3-2. PCI Clock Programming
Bit 7
Bit 6
Description
0
PCICLK frequency between 16 & 32 MHz
0
1
PCICLK frequency between 32 & 64 MHz
1
X
Reserved
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