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OPTIMOD
port. The Z-180 uses this port to communicate with the DSP IC700-IC707 via
host port interface pins 26, 35, and 41; and with EEPROM IC107 via pins 2, 5,
and 6. Communication is SPI type with Z-180 as master and DSP as slave.
2
RAM, ROM and EEPROM
A RAM chip provides temporary storage for Z-180 data and program code segments. A
ROM chip provides permanent storage of the executable control software and the execu-
table DSP software. System state information that must be maintained while the 6200 is
powered down is stored in an EEPROM. The EEPROM does not lose data when the
6200 is powered down.
Component-Level Description:
IC104 decodes Z-180 memory addresses to access instructions to execute from
ROM IC105 and to read or write data from 32KB RAM IC106. EEPROM IC107
is selected by latch IC611 pin 6.
3
Data Latches, Tri-State Data Buffers and Address Decoders
Digital logic decodes Z-180 I/O addresses, allowing the Z-180 to access RAM, ROM
and EEPROM. The logic provides Z-180 data bus allocation by using latches and tri-
state data buffers to allow other 6200 hardware to communicate to the Z-180. To control
other hardware, the Z-180's data bus state is latched at the appropriate time, and the
latched control signals are provided to other hardware. For the Z-180 to read information
from other hardware, the Z-180's data bus is connected at appropriate times to other
hardware's source signals through tri-state data buffers (e.g., IC120).
Component-Level Description:
Decoder IC104 allows the Z-180 to access ROM IC105 and RAM IC106. Decod-
ers IC101, IC102, and IC103 allow the Z-180 to access all other 6200 hardware.
The decoded outputs from IC101, IC102, and IC103 are used to latch the state of
the Z-180 data bus at appropriate times with data latches IC1, IC2, IC3 IC4, IC5,
IC6, IC9, IC303, IC604, IC611, IC708, and IC709, and to allocate the Z-180 data
bus at appropriate times to various peripherals via tri-state data buffers IC120 and
IC8. IC120 buffers or tri-states status information from the remote contact closure
circuitry onto the Z-180 data bus. IC8 buffers or tri-states information from the
user control interface onto the Z-180 data bus.
User Control Interface and LED Display Circuits
The user control interface enables the user to control the functionality of the 6200 unit. A
rear panel remote interface connector enables remote control of certain functions. Front
panel pushbutton switches select between various operational modes and functions. Data
latches detect and store the commands entered with these switches. Front panel status
LEDs indicate the control status of the unit, and meter LEDs indicate signal levels and
processing activity within the unit.
6-9
TECHNICAL DATA
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