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參數(shù)資料
| 型號： | TI380PCM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | PCI BUS INTERFACE FOR THE TI380 COMMPROCESSORS |
| 中文描述： | PCI總線接口，可用于TI380 COMMPROCESSORS |
| 文件頁數(shù)： | 15/40頁 |
| 文件大小： | 530K |
| 代理商： | TI380PCM |
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TI380PCIA
PCI BUS INTERFACE FOR THE TI380 COMMPROCESSORS
SPWS035 – JUNE 1997
15
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
serial EEPROM interface (EIF) (continued)
Several copies of the BIA can be programmed into the EEPROM user-defined space as a protection against
inadvertent modification of the copy of the BIA at addresses 0x09–0x0E.
In systems that do not use an EEPROM, the EDC pin should be tied low and the EDIO pin should be tied high.
This action causes default values to be loaded into the configuration registers as shown in Table 2. EDC and
EDIO are sampled at the deassertion of RST. If EDC is low and EDIO is high at the deassertion of reset, the
TI380PCIA functions as if no EEPROM is present in the system.
Table 2. EIF Configuration Registers
PARAMETER DESCRIPTION
EEPROM BYTE ADDRESS
DEFAULT VALUE
Vendor ID least significant byte
0x00
0x4C
Vendor ID most significant byte
0x01
0x10
Device ID least significant byte
0x02
0x08
Device ID most significant byte
0x03
0x05
Revision ID
0x04
0x01
Sub-class
0x05
0x80
Min_Gnt
0x06
0x01
Max_Lat
0x07
0x00
Checksum
0x08
0x7A
Burned-in address
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
BIA MSbyte
BIA byte
BIA byte
BIA byte
BIA byte
BIA LSbyte
BIA most significant checksum
BIA least significant checksum
TI2000 reserved byte
0x11
0x01
Reserved for future use
0x12 ... 0x20
Reserved
User-defined
0x21 ... 0xFF
User-defined
The default values for the parameters stored in the EEPROM can always be accessed by software because
copies of these values are stored in a series of hardwired registers in the TI380PCIA configuration space (see
Table 3). These registers are read-only and are unaffected by the process of loading data from the optional
EEPROM.
Table 3. Hardwired Registers in TI380PCIA Configuration Space
PARAMETER DESCRIPTION
HARDWIRED REGISTER NAME
(CONTAINS READ-ONLY COPY
OF DEFAULT VALUE)
REGISTER ADDRESS IN TI380PCIA
CONFIGURATION SPACE
Vendor ID
Hardwired vendor ID
4C
Device ID
Hardwired device ID
4C
Revision ID
Hardwired revision ID
50
Subclass
Hardwired subclass
50
Min_Gnt
Hardwired Min_Gnt
50
Max_Lat
Hardwired Max_Lat
50
A
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