Command transmit data register, The command transmit data – Digi NS9750 User Manual
Page 572
I 2 C r e g i s t e r s
5 4 8
N S 9 7 5 0 H a r d w a r e R e f e r e n c e
Command Transmit Data register
Address: 9050 0000
The Command Transmit Data (
CMD_TX_DATA_REG
) register is the primary interface
register for transmission of data between the NS9750 BBus and I
2
C bus. This register
is write only.
Register bit assignment
Bits
Access
Mnemonic
Reset
Description
D31:16
N/A
Reserved
N/A
N/A
D15
W
PIPE
00
hex
Pipeline mode
Must be set to 0.
D14
W
DLEN
00
hex
I
2
C DLEN port (
iic_dlen
)
Must be set to 0.
D13
W
TXVAL
00
hex
Provide new transmit data in
CMD_TX_DATA_REG
(
tx_data_val
).
D12:08
W
CMD
00
hex
Command to be sent (see "Master and slave module
commands," beginning on page 546)
D07:00
W
TXDATA
00
hex
Transmit data to I
2
C bus.
Table 337: CMD_REG and TX_DATA_REG
TXVAL
CMD
TXDATA
13
12
11
10
9
8
7
6
5
4
3
2
1
0
15
14
PIPE
DLEN
31
29
28
27
26
25
24
23
22
21
20
19
18
17
16
30
Reserved