cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 127

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

Revision 0.8
UART/IR Controller Functional Description
Note 1. Non-Extended Mode.
Note 2. Extended Mode.
4.11.1.1 UART Mode
UART mode supports serial data communication with a
remote peripheral device using a wired interface. This func-
tional block provides receive and transmit channels that
can operate concurrently in full-duplex mode. This func-
tional block performs all functions required to conduct par-
allel data interchange with the system and composite serial
data exchange with the external data channel.
Bank 4
Bank 5
Bank 6
Bank 7
Offset Name
04h-
00h-
04h-
00h-
05h-
04h-
05h-
02h
03h
07h
01h
02h
03h
07h
02h
03h
04h
07h
00h
01h
02h
03h
07h
00h
01h
02h
03h
04h
06h
07h
I/O
SH_FCR
BSR
RSVD
RSVD
IRCR1
BSR
RSVD
RSVD
BSR
IRCR2
RSVD
IRCR3
RSVD
SIR_PW
BSR
RSVD
IRRXDC
IRTXMC
RCCFG
BSR
IRCFG1
RSVD
IRCFG4
Table 4-19. UART/IR Controller Native Register Bit Map (Continued)
SHDM_DS
STRV_MS
R_LEN
RSVD
BKSE
BKSE
BKSE
BKSE
BKSE
7
RXFTH[1:0]
RSVD
START -LSB- DATA[5:8] -MSB- PARITY
MCPW[2:0]
SHMD_DS
Figure 4-34. UART Serial Data Stream Format
DBW[2:0]
RSVD
RSVD
T_OV
6
RSVD
RSVD
SET_IRTX
IRSL0_DS
RXHSC
RSVD
5
TXFTH[1:0]
AUX_IRRX
RCDM_DS
127
IRRX1_LV
RXINV
(Continued)
It performs parallel-to-serial conversion on data characters
received from the processor or a DMA controller, and
serial-to-parallel conversion on data characters received
from the serial interface. Figure 4-34 shows the serial data
stream. A data character contains five to eight data bits. It
is preceded by a START bit and is followed by an optional
PARITY bit and a STOP bit. Data is transferred in Little
Endian order (LSB first).
4
RSVD
RSVD
RSVD
RSVD
RSVD
RSVD
RSVD
RSVD
IRSL21_DS
BSR[6:0]
BSR[6:0]
BSR[6:0]
BSR[6:0]
BSR[6:0]
SPW3
RSVD
RSVD
RSVD
RSVD
3
STOP
IR_SL[1:0]
RSVD
MCFR[4:0]
DFR[4:0]
TXHSC
RSVD
SPW2
TXSR
2
IRIC[2:0]
IRMSSL
RXSR
SPW1
RSVD
1
RC_MMD[1:0]
RSVD
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IR_FDPLX
FIFO_EN
SPW0
0