参数资料
型号: S5933QE
厂商: APPLIEDMICRO INC
元件分类: 总线控制器
英文描述: PCI BUS CONTROLLER, PQFP160
封装: PLASTIC, QFP-160
文件页数: 153/176页
文件大小: 823K
代理商: S5933QE
3-89
INITIALIZATION
S5933
Byte
Binary
Offset
Length
Value
Description
Example
68h
8
not used
70h
4
[Expansion
ROM base addr.]
(example shows 32K bytes)
FFFF8001h
74h
8
not used
7Ch
1
[Interrupt line]
0Ch
7Dh
1
[Interrupt pin]
01h
7Eh
1
[Min-Grant]
00h
7Fh
1
[Max_lat]
00h
80h —
application specific
(1FFh), or
(2FFh), or
(3FFh), etc.
Byte checksum, location dependent on value for length field at offset 0002h.
Table 2. PC Compatible Expansion ROM (Continued)
A 16-bit pointer at location 18h of the PC expansion
ROM identifies the start offset of the PCI data struc-
ture. The PCI data structure is shown in Table 3 and
contains various vendor, product, and program evolu-
tions. If a valid external nv memory is identified by
the S5933, the PCI data structure is used to config-
ure the S5933. The PCI data structure is not neces-
sary for this device to operate. If no external nv
memory is implemented, the S5933 boots with the
default configuration values.
Byte
Binary
Offset
Length
Value
Description
0h
4
‘PCIR’
Signature, the ASCII string ‘PCIR’ where ‘P’ is at offset 0,
‘C’ at offset 1, and so on.
4h
2
var.
Vendor Identification
6h
2
var.
Device Identification
8h
2
var.
Pointer to Vital Product Data
Ah
2
var.
PCI Data Structure Length (starts with signature field)
Ch
1
var.
PCI Data Structure Revision (=0 for this definition)
Dh
3
var.
Class Code
10h
2
var.
Image Length
12h
2
var.
Revision Level
14h
1
var.
Code Type
15h
1
var.
Indicator (bit D7=1 signifies “last image”)
16h
2
0000h
Reserved
Table 3. PCI Data Structure
Note: If a serial BIOS ROM is used, the access time
for large serial devices should be considered, since it
may cause a lengthy system delay during initializa-
tion. For example, a 2-Kbyte serial device takes
about 1 second to be read. Many systems, even
when BIOS ROMs are ultimately shadowed into sys-
tem RAM, may read this memory space twice (once
to validate its size and checksum, and once to move
it into RAM). Execution directly from a serial BIOS
ROM, although possible, may be unacceptably slow.
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