am85c30 Advanced Micro Devices, am85c30 Datasheet - Page 2

• Manufacturer Part Number: am85c30
• Description: Enhanced Serial Communications Controller
• Manufacturer: Advanced Micro Devices

Enhancements that allow the Am85C30 to be used
more effectively in high-speed applications include:
BLOCK DIAGRAM
RELATED AMD PRODUCTS
2
Control
Am7960
80186
80286, 80C286
Data
A 10
A 14-bit SDLC/HDLC frame byte counter
Automatic SDLC/HDLC opening frame flag
transmission
TxD pin forced High in SDLC NRZI mode after
closing flag
Automatic SDLC/HDLC Tx underrun/EOM flag
reset
Automatic SDLC/HDLC Tx CRC generator reset/
preset
RTS synchronization to closing SDLC/HDLC flag
DTR/REQ deactivation delay significantly reduced
External PCLK to RxC or TxC synchronization
requirement eliminated for PCLK divide-by-four
operation
AMD
Part No.
19 bit SDLC/HDLC frame status FIFO array
8
5
+5 V GND PCLK
Control Lines
Interrupt
Bus VO
CPU
Coded Data Transceiver
Highly Integrated 16-Bit
Microprocessor
High-Performance 16-Bit
Microprocessor
Description
Interrupt
Control
Internal
Control
Logic
Logic
Internal Bus
Registers
Channel
Registers
Channel
Am85C30
A
B
Other enhancements to improve the Am85C30 inter-
face capabilities include:
Write data valid setup time to falling edge of WR
requirement eliminated
Reduced INT response time
Reduced access recovery time (t
best case (3 1/2 PCLK worst case)
Improved Wait timing
Write Registers WR3, WR4, WR5, and WR10
made readable
Lower priority interrupt masking without INTACK
Complete SDLC/HDLC CRC character reception
Am9517A
5380, 53C80
80188
Am386
Part No.
Channel A
Generator
10 19 Bit
Baud
Frame
Status
Rate
FIFO
Channel B
Transmitter
Receiver
Control
DMA Controller
SCSI Bus Controller
Highly Integrated 8-Bit
Microprocessor
High-Performance 32-Bit
Microprocessor
Logic
Description
RC
) to 3 PCLK
TxDA
RxDA
RTxCA
TRxCA
DTR/REQA
SYNCA
W/REQA
RTSA
CTSA
DCDA
10216F-1
TxDB
RxDB
RTxCB
TRxCB
DTR/REQB
SYNCB
W/REQB
RTSB
CTSB
DCDB