参数资料
型号: TSB43AA82GGW
厂商: TEXAS INSTRUMENTS INC
元件分类: 微控制器/微处理器
英文描述: 2 CHANNEL(S), 400M bps, SERIAL COMM CONTROLLER, PBGA176
封装: PLASTIC, BGA-176
文件页数: 4/146页
文件大小: 770K
代理商: TSB43AA82GGW
91
9 DMA Interface
9.1
Mode Setting
BDOMode and BDIMode register settings on the CFR determine the DMA interface transaction mode. The BDIF has
eight valid modes of operation. These modes are selected using the BDIMODE and BDOMODE fields of the BDIF
control register. Table 91 shows the basic features of each mode. Modes other than those specified below are not
supported.
Table 91. Modes of the Bulky Data Interface
MODE
A
B
C
D
E
F
G
H
BDIMODE
000
001
010
011
100
101
110
111
BURST
0
0 or 1
0
0 or 1
0 - SYNC
1 - ATAPI
0 or 1
BDOMODE
00
01
10
11
01
10
11
Description
8-bit parallel
in/out
8-bit parallel
in/out
8-bit
bidirectional
in/out
8-bit
bidirectional
in/out
8-bit
bidirectional
in/out
(SCSI mode)
16-bit
bidirectional
in/out
16-bit
bidirectional
in/out
(ATAPI)
16-bit
bidirectional
in/out
(SCSI mode)
Data input
BDIO[7:0]
BDIO[15:0]
Data output
BDIO[15:8]
BDIO[7:0]
BDIO[15:0]
Duplex
Full
Half
In/out select
CFR or
BDOEN
CFR
CFR
or BDOEN
CFR
Input control
BDIEN
synchronous
BDIEN
asynchro-
nous
BDIEN
asynchro-
nous
BDIEN and
BDOEN
synchronous
BDRD and
BDWR
asynchro-
nous
BDIEN
asynchro-
nous
BDIEN and
BDOEN
synchronous
BDRD and
BDWR
asynchro-
nous
Output control
BDOEN
synchronous
BDOEN
asynchro-
nous
BDOEN
asynchro-
nous
BDIEN and
BDOEN
synchronous
BDRD and
BDWR
asynchro-
nous
BDOEN
asynchro-
nous
BDIEN and
BDOEN
synchronous
BDRD and
BDWR
asynchro-
nous
CONTROL SIGNAL USE
BDIEN
BDIBUSY
BDOEN
BDOAVAIL
BDIF[2:0]
BDOF[2:0]
BDACK
ATACK
ATAPI mode only
Mode A
Input and output data are synchronous with BDICLK. Input data is written when BDIEN is true and
BDIBUSY is false. Output data is updated with BDOEN and BDOAVAIL are true.
Mode B
The input data is asynchronous with BDIEN. The output data is updated when data is written
asynchronously with BDOEN. When BDOEN is false, the output data is high impedance.
Mode C
Data is input by BDIEN input and BDIBUSY is false, and is updated when both BDOEN and
BDOAVAIL are true.
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