MT8931CP datasheet(2/40 Pages) MITEL

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MT8931C

9-72

Figure 2 - Pin Connections

Pin Description

Pin #

Name

Description

DIP PLCC

HALF

HALF Input/Output: this is an input in NT mode and an output in TE mode identifying

which half of the S-interface frame is currently being written/read over the ST-BUS

(HALF = 0 sampled on the falling edge of C4b within the frame pulse low window,

identiﬁes the information to be transmitted/received in the ﬁrst half of the S-Bus frame

while HALF=1 identiﬁes the information to be transmitted/received into the second half

of the S-Bus frame). Tying this pin to V

SS or VDD in NT mode will allow the device to free

run. This signal can also be accessed from the ST-BUS C-channel.

C4b

4.096 MHz Clock: a 4.096 MHz ST-BUS Data Clock input in NT mode.

In TE mode an output 4.096 MHz clock phase-locked to the line data signal.

F0b

Frame Pulse: an active low frame pulse input indicating the beginning of active ST-

BUS channel times in NT mode. Frame pulse output in TE mode.

F0od

Delayed Frame Pulse Output: an active low delayed frame pulse output indicating

the end of active ST-BUS channels for this device.

Can be used to daisy chain

to other ST-BUS devices to share an ST-BUS stream.

DSTi

Data ST-BUS Input: a 2048 kbit/s serial PCM/data ST-BUS input with D, C, B1, and B2

channels assigned to the ﬁrst four timeslots. These channels contain data to be

transmitted on the line and chip control information.

DSTo

Data ST-BUS Output: a 2048 kbit/s serial PCM/data ST-BUS output with D, C, B1 and

B2 channels assigned to the ﬁrst four timeslots, respectively. The remaining timeslots

are placed into high impedance. These channels contain data received from the line

and chip status information.

XTAL2/IC Crystal 2/Internal Connection: in TE mode, XTAL1 and XTAL2 are to be connected to

an external 4.096 MHz parallel resonant crystal for the on-chip oscillator.

If XTAL1 is connected directly to a 4.096 MHz clock, this pin must be left unconnected.

In NT mode, this pin must be left unconnected.

XTAL1/NT Crystal 1/Network Termination Mode Select Input: for TE mode mode selection, a

4.096 MHz crystal is to be connected between the XTAL1 and XTAL2 pins, or a 4.096

MHz clock can be connected directly to XTAL1. For NT mode selection, this pin must

be tied to VDD. A pull-up resistor is needed when driven by a TTL device.

HALF

C4b

F0b

F0od

DSTi

DSTo

XTAL2/NC

XTAL1/NT

R/W/WR

DS/RD

AS/ALE

IRQ/NDA

VSS

VDD

VBias

LTx

LRx

STAR/Rsto

Rsti

AD7

AD6

AD5

AD4

AD3

AD2

AD1

AD0

28 PIN PDIP

44 PIN PLCC

STAR/Rsto

Rsti

AD7

AD6

AD5

AD4

AD3

F0od

DSTi

DSTo

XTAL2/NC

XTAL1/NT

R/W/WR

DS/RD

65432

44 43 42 41 40

18 19 20 21 22

24 25 26 27 28

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