TNETA1585

ATM TRAFFIC MANAGEMENT SCHEDULER DEVICE

WITH RECEIVE UTOPIA AND COPROCESSOR INTERFACES

SDNS041A – NOVEMBER 1996 – REVISED JULY 1998

25

POST OFFICE BOX 655303

timing requirements (see Figure 8)

slave interface – read operation

NO.

MIN

MAX

UNIT

1

tsu(SCAD)

Setup time, SCAD5–SCAD0 valid before CLOCK

↑

17

ns

2†

tsu(SCSEL)

Setup time, SCSEL low before CLOCK

↑

13

ns

3

tsu(SCWE)

Setup time, SCWE high before CLOCK

↑

6

ns

4†

tsu(SCOE)

Setup time, SCOE low before CLOCK

↑

13

ns

5

th(SCAD)

Hold time, SCAD5–SCAD0 valid after CLOCK

↑

1

ns

6‡

th(SCSEL)

Hold time, SCSEL low after CLOCK

↑

3

ns

7

th(SCWE)

Hold time, SCWE high after CLOCK

↑

1

ns

8‡

th(SCOE)

Hold time, SCOE low after CLOCK

↑

2

ns

† These measurements are taken with the data enabled 4 ns before the rising edge of the clock.

‡ These measurements are taken with the data disabled at the time of the rising edge of the clock.

operating characteristics over recommended operating conditions (see Figure 8)

slave interface – read operation

NO.

PARAMETER

MIN

MAX

UNIT

9

td(SCDATA)1

Delay time, from SCAD5–SCAD0 to SCDATA31–SCDATA0 valid

5

13

ns

10

td(SCDATA)2

Delay time, from SCSEL

↓ to SCDATA31–SCDATA0 enabled

3

10

ns

11

td(SCDATA)3

Delay time, from SCOE

↓ to SCDATA31–SCDATA0 enabled

4

11

ns

12

td(SCDATA)4

Delay time, from SCSEL

↑ to SCDATA31–SCDATA0 disabled

4

9

ns

13

td(SCDATA)5

Delay time, from SCOE

↑ to SCDATA31–SCDATA0 disabled

4

9

ns

SCDATA31–

SCDATA0

(output)

SCOE

(input)

SCSEL

(input)

Valid

SCAD5–

SCAD0

(input)

11

5

Valid

9

CLOCK

(input)

1

SCWE

(input)

4

10

2

8

13

6

12

7

3

Z

Z

Figure 8. Slave Interface – Read Operation