HD64570 Datasheet, PDF (18/469 Pages) Hitachi Semiconductor – Serial Communications Adaptor

1.3 Basic Functions
Table 1.1 Major Functions of the SCA
Item
MSCI (multiprotocol
serial communication
interface)
Bus interface
Specification
Maximum data transfer 7.1 Mbits/s (f = 10 MHz)
rate
12 Mbits/s (f = 16.7 MHz)
5.7 Mbits/s (f = 8 MHz)*
Number of channels 2
Operating modes
Normal operating mode (full duplex)
Auto echo mode
Local loop back mode
Protocol functions
Asynchronous: 5 to 8 bits, parity (odd, even, or
none)
Byte synchronous: mono-sync, bi-sync, or
external synchronization
Bit synchronous: HDLC mode
Error detection
Five types (parity error, framing error, CRC error,
overrun error, underrun error)
Transmission codes Five types (NRZ, NRZI, FM0, FM1, Manchester)
FIFO
Transmit32 bytes/receive32 bytes
Clock sources
Internal clock sources:
1. On-chip baud rate generators can generate
arbitrary baud rates (independent transmit/
receive baud rate generators are provided for
each channel)
2. On-chip digital PLL (independent ADPLLs for
each receive channel)
Modem control
ADPLL (Advanced
digital PLL)
External clock
CTS, RTS, DCD
On-chip advanced digital PLLs:
1. For extraction of clock signals
2. For suppressing noise in received data and
clock signals
Baud rate generator
MPU modes
On-chip (independent transmit and receive baud
rate generators for each channel)
Four externally selectable modes:
1. 8086-system 16-bit MPU
2. 64180-system 8-bit MPU
3. 68000-system 16-bit MPUI
4. 68000-system 16-bit MPUII
Data bus width
Address bus width
8 or 16 bits
24 bits
Rev. 0, 07/98, page 2 of 453