GP2021 Datasheet, PDF (5/62 Pages) Mitel Networks Corporation – GPS 12 channel Correlator Advance Information

GP2021
Pin No
Signal Name Type
2
POWER_GOOD
I
3
NRESET_OP O
4
NARMSYS
I
5
XIN
I
6
XOUT
O
7
TXA
O
8
TXB
O
9
RXA
1
10
RXB
I
11
NROM / NC
O
12
NEEPROM / NC O
13
NSPARE_CS / NC O
16
NRAM / NC
O
17
NW0 / NC
O
18
NW1 / NC
O
19
NW2 / NC
O
20
NW3 / NC
O
21
NRD / NC
O
22
ARM_ALE / NC
O
23
DBE / NC
O
24
ACCUM_INT
O
25
MEAS_INT
O
26
NBW / WRPROG
I
27
NMREQ / DISCIP2 I
28 NOPC / NINTELMOT I
29
NRW / DISCIP3
I
30
MCLK / NC
O
Description ARM System Mode
Description Standard Interface
Mode
Power Monitor input. High for normal operation. Low forces the GP2021 into
Power Down mode.
System Reset output (Active Low). Lasts for 4 MICRO_CLK cycles after all reset
conditions have cleared.
Processor Mode Selection input. When Low, this input selects ARM System
mode. When High, Standard Interface mode is selected.
Crystal input connection to Real Time Clock.
Crystal output connection from Real Time Clock.
Transmit Data output from Channel A of the Dual UART.
Transmit Data output from Channel B of the Dual UART.
Receive Data input to Channel A of the Dual UART. This pin acts as a master clock
input in Digital System Test mode.
Receive Data input to Channel B of the Dual UART. This pin acts as the Real Time
Clock reset in Digital System Test mode.
ROM Chip Select output (Active Low).
Unused output. (Do not connect.)
EEPROM Chip Select output (Active Low) Unused output. (Do not connect.)
Spare Chip Select output (Active Low).
Unused output. (Do not connect.)
RAM Chip Select output (Active Low).
Unused output. (Do not connect.)
Byte 0 Write Strobe output (Active Low). Unused output. (Do not connect.)
Byte 1 Write Strobe output (Active Low). Unused output. (Do not connect.)
Byte 2 Write Strobe output (Active Low). Unused output. (Do not connect.)
Byte 3 Write Strobe output (Active Low). Unused output. (Do not connect.)
Read Data Strobe output (Active Low).
Unused output. (Do not connect.)
ALE output to the microprocessor
(Active High). Controls the transparent
latches at the microprocessor address
outputs.
Unused output. (Do not connect.)
Data Bus Enable output to the
microprocessor. When Low, places the
microprocessor data bus drivers in a
high impedance state.
Unused output. (Do not connect.)
A free running interrupt to the microprocessor. It allows control of data transfer
between the accumulators in the correlator and the microprocessor. It is active
Low when configured for ARM System mode or Motorola mode and is active High
in Intel mode.
An interrupt to the microprocessor. It allows control of measurement data transfer
between the correlator and the microprocessor. It is active Low when configured
for ARM System mode or Motorola mode and is active High in Intel mode.
Byte/Word input from the
microprocessor. Low indicates a byte
transfer, and High a word transfer.
Write–Read Program input. In Intel
mode, High selects 486 style
interface and Low 186 style.
Unused in Motorola mode
Memory Request input from the
microprocessor. Low indicates that the
microprocessor requires a memory
access during the following cycle.
Multi–purpose discrete input.
Opcode fetch input from the
microprocessor. Low indicates that an
instruction is being fetched and High
that data is being transferred.
High selects Motorola mode and
Low Intel mode.
Read/Write Select input from the
microprocessor. Low indicates a read
cycle and High a write cycle.
Multi–purpose discrete input.
Microprocessor Clock output
(nominally 20MHz). Its phases can be
stretched under control of the
Microprocessor Interface.
Unused output. (Do not connect.)
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