User`s manual

Host Computer Hardware
Motorola Functional Description 3-5
Figure 3-3. Command Converter Block Diagram
3.1.4 Command Converter Handshake Signals
The DSP56002 on the command converter card is configured in such a way that bits 0–7
of its Port B are used for 8-bit data transfers, and bits 8–14 are used for data transfer
control.
There are three output control bits in the middle order byte of the DSP56002 Port B data
word. These bits are the ADM_INT, ADM_REQ, and ADM_ACK signals. ADM_REQ
and ADM_ACK, act as handshake lines for reading and writing data. ADM_INT acts as a
flag to indicate whether the ADM is requesting host computer service. These three control
bits are part of the host parallel control bus. They are enabled when the host computer
selects the ADM.
BUFFER &
I/P SELECT
DSP56002
SCI
PORT B
PORT A
SSI
20MHZ
IRQ A
NMI
PLL
32K
WORDS
SRAM
GAL
DECODER
BUFFER
37-PIN HOST COMPUTER INTERFACE CONNECTOR
+5V
VOLTAGE
TRANSLATOR
CLOCK
14--PIN TARGET JTAG/ONCE CONNECTOR
AA1947