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參數(shù)資料
| 型號： | 5962R0722402VYC |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PQFP256 |
| 封裝： | QFP-256 |
| 文件頁數(shù)： | 105/155頁 |
| 文件大?。?/td> | 4139K |
| 代理商： | 5962R0722402VYC |
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AT697F PRELIMINARY INFORMATION
53
7703D–AERO–12/09
PR
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load/store instruction types. The PCI bus foresees 32 bit wide transactions with byte-enables for
each byte lane.
Initiator Mapping
For standard operation, the PCI interface only works in a limited address range. The address
range for such initiator transaction is limited to addresses between 0xA0000000 and
0xF0000000.
PCI addresses outside of this predefined range can be accessed only via DMA transactions.
Instructions of different width (byte, half-word, word, double) can be performed for each address
of the PCI address range. The three low significant bits of the address A[2:0] are used to deter-
mine which PCI byte enable line C/BE*[3:0] should be active during the transaction.
According to the SPARC architecture, big-endian mapping is implemented, the most significant
byte standing at the lower address (0x..00) and the least significant byte standing to the upper
address (0x..03).
A byte-writing to A[1:0] = 00 results in the byte enable pattern 0111, indicating that the e most
significant byte lane (bits 31:24) of the PCI data bus is selected.
The following table presents the transaction width authorized for PCI transfers.
Table 20. Byte Enable Settings
width
8
16
32
64
Assembler
ld[s/u]b, stb
ld[s/u]h, sth
ld, st
ldd, std
C-datatype
char
short
int
long long
A[2:0]=000
0111
0011
0000
0000 (burst)
A[2:0]=100
0111
0011
0000
not aligned
A[2:0]=x01
1011
not aligned
A[2:0]=x10
1101
1100
not aligned
A[2:0]=x11
1110
not aligned
Note:
PCI byte enables are active low.
For non-aligned accesses, the byte enable pattern (1111) is issued on PCI, to avoid destroying
data in the remote PCI target.
Memory cycles
Many memory transactions such as memory-read/write and memory-read-line/write-invalidate
can be issued from the processor with common SPARC instruction set. Selection of the com-
mand to execute is performed setting the value PCIIC COMMSB.
Setting logical ‘01’ in PCIIC COMMSB result in the generation of memory read/write access
when PCI address is accessed. A logical value of ‘10’ result in a memory read line or write and
invalidate on PCI address access.
For the memory commands the address issued on the PCI bus is a word address with bits (1:0)
set to 00. This indicates that the linear incrementing mode is used.
operation
The following procedure shall be used to engage memory transaction on the PCI interface:
1.
Select the initiator mode by setting logical one in the PCIIC MOD.
2.
Select the memory load/store command or the memory read-line/write and invalidate
command in the PCI initiator configuration register. The PCIIC COMMSB shall be set
logical ‘01’ for simple load/store operation and shall be set logical ’11’ for read-line/write-
&-invalidate.
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