W83977AF Information Storage Devices, Inc, W83977AF Datasheet - Page 65

• Manufacturer Part Number: W83977AF
• Description: W83877TF Plus Kbc, Cir, RTC
• Manufacturer: Information Storage Devices, Inc

4.2 Set0-Legacy/Advanced IR Control and Status Registers
4.2.1 Set0.Reg0 - Receiver/Transmitter Buffer Registers (RBR/TBR) (Read/Write)
Receiver Buffer Register is read only and Transmitter Buffer Register is write only. When operate in
the PIO mode, the port is used to Receive/Transmit 8-bit data.
When function as a legacy IR, this port only supports PIO mode. If set in the advanced IR mode and
configured as MIR/FIR/Remote IR, this port can support DMA transmission. Two DMA channels can
be used simultaneously, one for TX DMA and the other for RX DMA. Therefore, single DMA channel
is also supported when set the bit of D_CHSW (DMA Channel Swap, in Set2.Reg2.Bit3) and the
TX/RX DMA channel is swapped. Note that two DMA channel can be defined in configure register
CR2A which selects DMA channel or disables DMA channel. If only RX DMA channel is enabled
while TX DMA channel is disabled, then the single DMA channel will be selected.
4.2.2 Set0.Reg1 - Interrupt Control Register (ICR)
The advanced IR functions including Advanced SIR/ASK-IR, MIR, FIR, or Remote IR are described
as follows.
Bit 7:
Bit 6:
Bit 5:
Advanced IR
Address Offset Register Name
Legacy IR
Mode
0
1
2
3
4
5
6
7
Legacy IR Mode:
Advanced IR Mode:
Legacy IR Mode:
MIR, FIR mode:
Advanced SIR/ASK-IR, Remote IR:
Legacy IR Mode:
Advanced SIR/ASK-IR, MIR, FIR, Remote IR:
Not used. A read will return 0.
ETMRI - Enable Timer Interrupt
A write to 1 will enable timer interrupt.
Not used. A read will return 0.
EFSFI - Enable Frame Status FIFO Interrupt
A write to 1 will enable frame status FIFO interrupt.
Not used.
Not used. A read will return 0.
ETXTHI - Enable Transmitter Threshold Interrupt
A write to 1 will enable transmitter threshold interrupt.
ETMRI
B7
0
UDR/ESCR
RBR/TBR
UCR/SSR
ISR/UFR
HCR
USR
HSR
ICR
EFSFI
B6
0
Receiver/Transmitter Buffer Registers
Interrupt Control Register
Interrupt Status or IR FIFO Control Register
IR Control or Sets Select Register
Handshake Control Register
IR Status Register
Handshake Status Register
User Defined Register
ETXTHI
B5
0
- 53 -
EDMAI
B4
0
Register Description
W83977F/ W83977AF
B3
0
0
Publication Release Date: March 1998
EUSRI/
EUSRI
TXURI
B2
PRELIMINARY
ETBREI
ETBREI
B1
Revision 0.58
ERDRI
ERBRI
B0