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: 15/176页
文件大小: 823K
代理商: S5933QE
3-124
FIFO OVERVIEW
S5933
The configurable FIFO advance condition may be
used to transfer data to and from Add-On interfaces
which are not 32-bits wide. For a 16-bit Add-On bus,
the Add-On to PCI FIFO advance condition can be
set to byte 2. This allows a 16-bit write to the lower 16-
bits of the FIFO register (bytes 0 and 1) and a second
write to the upper 16-bits of the FIFO register (bytes
2 and 3). The FIFO does not advance until the
second access. This allows the Add-On to operate
with 16-bit data, while the PCI bus maintains a 32-bit
data path.
Notes:
1. During operation, the INTCSR FIFO advance condition bits
(D29:26) should only be changed when the FIFO is empty and
is idle on both the Add-On and PCI interfaces.
Endian Conversion
Bits D31:30 and D25:24 of the INTCSR PCI Opera-
tion Register control endian conversion operations for
the FIFO (Figure 1). When endian conversion is per-
formed, it affects data passing in either direction
through the FIFO interface. Figures 2a and 2b show
16-bit and 32-bit endian conversion. It is important to
note that endian conversion is performed on data BE-
FORE it enters the FIFO. This affects the FIFO ad-
vance condition. Example: the FIFO is configured to
perform 32-bit endian conversion on data, and the
FIFO advance condition is set to byte 0. Byte 3 is
written into the FIFO (BE3# asserted). After the
endian conversion, byte 3 becomes byte 0, and the
FIFO advances. This behavior must be considered
when not performing full 32-bit accesses to the FIFO.
Notes:
1. During operation, the INTCSR FIFO endian conversion bits
(D25:24) and 64-bit access bits (D31:30) should only be
changed when the FIFO is empty and is idle on both the Add-
On and PCI interfaces.
Figure 2a. 16-bit Endian Conversion
DESTINATION
D 31-24
D 23-16
D 15-8
D 7-0
BYTE 3
BYTE 2
BYTE 1
BYTE 0
BYTE 3
BYTE 2
BYTE 1
BYTE 0
D 31-24
D 23-16
D 15-8
D 7-0
SOURCE
Figure 2b. 32-bit Endian Conversion
DESTINATION
D 31-24
D 23-16
D 15-8
D 7-0
BYTE 3
BYTE 2
BYTE 1
BYTE 0
BYTE 3
BYTE 2
BYTE 1
BYTE 0
D 31-24
D 23-16
D 15-8
D 7-0
SOURCE
相关PDF资料
PDF描述
S6A0032 16 X 80 DOTS DOT MAT LCD DRVR AND DSPL CTLR, UUC138
S6A0069 16 X 40 DOTS DOT MAT LCD DRVR AND DSPL CTLR, UUC80
S6A0078 34 X 120 DOTS DOT MAT LCD DRVR AND DSPL CTLR, UUC183
S80296SA40 16-BIT, 40 MHz, MICROCONTROLLER, PQFP100
S80486-DX4-75-S-V-8-B 32-BIT, 75 MHz, MICROPROCESSOR, PQFP208
相关代理商/技术参数
参数描述
S5935 制造商:AMCC 制造商全称:Applied Micro Circuits Corporation 功能描述:PCI Product
S5935_07 制造商:AMCC 制造商全称:Applied Micro Circuits Corporation 功能描述:PCI Product
S59355QRC 制造商:AppliedMicro 功能描述:
S5935QF 制造商:AMCC 制造商全称:Applied Micro Circuits Corporation 功能描述:PCI Product
S5935QRC 制造商:AppliedMicro 功能描述:PCI Master Device 160-Pin PQFP