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: 16/176页
文件大小: 823K
代理商: S5933QE
3-125
FIFO OVERVIEW
S5933
64-Bit Endian Conversion
Because the S5933 interfaces to a 32-bit PCI bus, special operation is required to handle 64-bit data endian
conversion. Figure 2c shows 64-bit endian conversion. The S5933 must know whether the lower 32-bits enter the
FIFO first or the upper 32-bits enter the FIFO first. INTCSR D31:30 identify which method is used by the
application. These bits toggle after each 32-bit operation to indicate if half or all of a 64-bit data operation has
been completed. The initial state of these bits establishes the loading and emptying order for 64-bit data during
operation.
Figure 2c. 64-bit Endian Conversion
DESTINATION
D 31-24
D 23-16
D 15-8
D 7-0
BYTE 7
BYTE 6
BYTE 5
BYTE 4
BYTE 3
BYTE 2
BYTE 1
BYTE 0
D 31-24
D 23-16
D 15-8
D 7-0
SOURCE
BYTE 7
BYTE 6
BYTE 5
BYTE 4
BYTE 3
BYTE 2
BYTE 1
BYTE 0
SLR
READ ORDER:
BYTES 3-0 FIRST
OR
BYTES 7-4 FIRST
SEE TEXT
LOAD ORDER:
BYTES 3-0 FIRST
OR,
BYTES 7-4 FIRST
SEE TEXT
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