GP2021 datasheet(14/62 Pages) MITEL

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GP2021

PLL_LOCK

NRESET_OP

MICRO_CLK

4 CYCLES

MCLK

50ms

NRESET_IP

NRESET_OP

MICRO_CLK

4 CYCLES

Fig. 11 : PLL_LOCK Hardware Reset Generation

Fig. 12 : NRESET_IP Hardware Reset Generation

Discrete I/O

The GP2021 contains a number of pins which may be used

as discrete inputs or discrete outputs for general purpose

system monitoring and control applications. The actual pins

which may be used for each function vary according to the

application and the interface mode of the GP2021.Table 5

shows a list of possible discrete inputs and outputs and the

modes in which they may be used. The level on all discrete

inputs can be read from the IO_CONFIG register. The status

the

DISCIP

may

also

read

from

ACCUM_STATUS_B. The discrete outputs are controlled via

either the SYSTEM_SETUP or IO_CONFIG registers.

Discrete Inputs

Pin Name

Read Location

Conditions for use as Discrete Input

NRW/DISCIP3

IO_CONFIG

Standard Interface mode.

NOPC/NINTELMOT

IO_CONFIG

ARM System mode (debug disabled).

NMREQ/DISCIP2

IO_CONFIG

Standard Interface mode.

NBW/WRPROG

IO_CONFIG

Motorola mode only.

DISCIO

IO_CONFIG

DISCIO configured as discrete Input.

NBRAM/DISCIP4

IO_CONFIG

Standard Interface Mode.

MULTI_FN_IO

IO_CONFIG

MULTI_FN_IO configured as discrete input.

SIGN0, MAG0

IO_CONFIG

Single real input mode (GP2010 or GP2015) front end using

SIGN0, MAG0.

SIGN1, MAG1

IO_CONFIG

Single real input mode (GP2010 or GP2015) front end using

SIGN1, MAG1.

DISCIP1

IO_CONFIG

Always available – dedicated Discrete Input.

ACCUM_STATUS_B

RXA

IO_CONFIG

UART Channel A not used.

RXB

IO_CONFIG

UART Channel B not used.

Discrete Outputs

Pin Name

Configuration

Possible Outputs

Location

DISCOP

SYSTEM_SET_UP

High, Low, CH0 Dump, TIMEMARK, 100kHz Square Wave, Scan Out.

DISCIO

IO_CONFIG

High, Low, TIMEMARK, 100kHz Square Wave.

MULTI_FN_IO

IO_CONFIG

High, Low, TIMEMARK, 100kHz Square Wave.

Table 5 : Discrete Input/Output Configuration

GP2021 Datasheet(PDF) 14 Page - Mitel Networks Corporation

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