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Serial port control and status registers
636
NS9750 Hardware Reference
Serial Channel B/A/C/D Flow Control register
Address: 9020 0034 / 0074
9030 0034 / 0074
The Serial Channel B/A/C/D Flow Control register allows you to define the flow
control operation of the serial controller.
Register bit assignment
Bits Access Mnemonic Reset Description
D31:10 R Not used 0x000000 Always read as0x000000.
D09:08 R/W
FLOW_STATE
10 Flow control state
00 Software-initiated XON
01 Software-initiated XOFF
10 Hardware-initiated XON
11 Hardware-initiated XOFF
Defines the current state of the flow control logic.
D07:06 R/W FLOW4 10 Flow control enable
00 Disabled
01 Disabled
10 Change field FLOW_STATE to XON upon
match
11 Change field FLOW_STATE to XOFF upon
match
Allows you to define the flow control characteristics
using fields RDMB4 (see "RDMB4" on page 634)
and RMMB4 (see "RMMB4" on page 635).
Table 378: Serial Channel B/A/C/D Flow Control register
FLOW_
STATE
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
Not used
Not used
FLOW4 FLOW3 FLOW2 FLOW1