cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 399

• Manufacturer Part Number: cs5535
• Description: Geode Cs5535 Companion Multi-function South Bridge
• Manufacturer: National Semiconductor Corporation

Revision 0.8
UART/IR Controller Register Descriptions
5.12.10.6 IR Interface Configuration 4 Register (IRCFG4)
I/O Offset
Type
Reset Value
IRCFG4 configures the receiver data path.
Bit
7:6
2:0
5
4
3
IRSL0_DS (IRCFG4, bit 5)
7
RSVD
Name
RSVD
IRSL0_DS
RXINV
IRSL21_DS
RSVD
0
0
1
1
07h
R/W
00h
6
Description
Reserved. Must be written 0.
IRSL0/IRRX2 Pin Direction Select. This bit determines the direction of the
UART[x]_IRSL0/IRRX2 pin. See Table 5-51.
0: Pin direction is input (UART[x]_IRRX2).
1: Pin direction is output (UART[x]_IRSL0).
IRRX Signal Invert. This bit supports optical transceivers with receive signals of oppo-
site polarity (active high instead of active low). When set to 1, an inverter is placed in the
receiver input signal path.
Reserved. Must be written 1.
Reserved. Must be written 0.
IRSL0_DS
5
Table 5-51. IR Receive Input Selection
IRCFG4 Bit Descriptions
AUX_IRRX (IRCR2, bit 4)
IRCFG4 Register Map
RXINV
4
399
(Continued)
0
1
0
1
IRSL21_DS
3
2
Selected IRRX
None Selected
RSVD
IRRX1
IRRX2
IRRX1
1
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