TMS320C44

DIGITAL SIGNAL PROCESSOR

SPRS031B – AUGUST 1994 – REVISED DECEMBER 1995

39

POST OFFICE BOX 1443

NO.

MIN

MAX

UNIT

1‡

td(CRQL - CAL)T

Delay time, CREQx low to start of CACKx going low for

token-request-acknowledge

P+5

2P + 22

ns

2‡

td(CRDYL - CAL)T

Delay time, CRDYx low at end of word-transfer out to start of CACKx going low

P+6

2P + 27

ns

3

td(CAL - CD)I

Delay time, start of CACKx going low to CxDx change from outputs to inputs

0.5P – 8

0.5P + 8

ns

4

td(CAL - CRDY)T

Delay time, start of CACKx going low to CRDYx change from an input to output,

high level

0.5P – 8

0.5P + 8

ns

5‡

td(CRQH - CRQ)T

Delay time, CREQx high to CREQx change from an input to output, high level

4

22

ns

6‡

td(CRQH - CA)T

Delay time, CREQx high to CACKx change from output to an input

4

22

ns

7‡

td(CRQH - CS)T

Delay time, CREQx high to CSTRBx change from output to an input

4

22

ns

8‡

td(CRQH - CRQL)T

Delay time, CREQx high to CREQx low for the next token-request

P–4

2P + 8

ns

9

td(CAL - CDIRH)

Delay time, CACKx low to CDIRx high, change from output to input

0.5P – 8

0.5P + 10

ns

† These values are characterized but not tested.

‡ These timing parameters result from synchronizer delays and are referenced from the falling edge of H1. The inputs (that cause the output-signal

pins to change values) are sampled on H1 falling. The minimum delay occurs when the input condition occurs just before H1 falling, and the

maximum delay occurs when the input condition occurs just after H1 falling.

CREQx

CACKx

CSTRBx

CxDx

CRDYx

= When signal is an input (clear = when signal is an output).

Valid Data

1

5

6

7

8

3

4

2

Valid Data

CDIRx

9

NOTE A: Before the token exchange, CACKx, CSTRBx, and CxD7 – CxD0 are asserted by the ’C44 sending data. CREQx and CRDYx are

input signals asserted by the ’C44 receiving data and are asynchronous with respect to the H1 clock of the sending ’C44. After token

exchange, CREQx and CRDYx become outputs, and CSTRBx, CACKx, and CxD7 – CxD0 become inputs.