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Control Interface Truth Tables

The following are truth tables for the control interface.

Table I. Basic Control Functions

Control Pins

Reset

Update

Function

XXXX

Global Reset. Reset all second rank enable bits to zero (disable all outputs).

Control Disable. Ignore all logic (but the signal matrix still functions as

programmed). D[6:0] are high-impedance.

Single Output Preprogram. Write input conﬁguration data from data bus D[6:0].

into ﬁrst rank of latches for the output selected by the output address bus A[4:0].

Single Output Readback. Readback input conﬁguration data from second rank of latches

onto data bus D[6:0] for the single output selected by the output address bus A[4:0].

Global Update. Copy input conﬁguration data from all 17 ﬁrst rank latches into second

rank of latches, updating signal matrix connections for all outputs.

0010

Transparent Write and Update. It is possible to write data directly onto rank two. This

simpliﬁes logic when synchronous signal matrix updating is not necessary.

Table II. Address/Data Examples

Output Address Pins

Enable

Input Address Pins

MSB–LSB

Bit

MSB-LSB

D6/E

Function

00000X

000000Lower Address/Data Range. Connect Output #00

(A[4:0] = 00000) to Input #00 (D[5:0] = 000000).

10000X

100000Upper Address/Data Range. Connect Output #16

(A[4:0] = 10000) to Input #32 (D[5:0] = 100000).

<Binary Output Number

Enable Output. Connect Selected Output (A[4:0] = 0

to 16) to Designated Input (D[5:0] = 0 to 32) and

Enable Output (D6 = 1).

<Binary Output Number

XXXXXXDisable Output. Disable Speciﬁed Output (D6 = 0).

10001X

Broadcast Connection. Connect all 17 outputs to

same designated input and set all 17 enable bits to

the value of D6. Readback is not possible with the

broadcast address.

10010X

100001Reserved. Any address or data code greater or equal

to these are reserved for future expansion or factory

testing.

*The binary output number may also be the broadcast connection designator, 10001X.

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