PCI950

IRQSER DESERIALIZER

SCPS015 – JULY 1997 – REVISED JANUARY 1998

5

POST OFFICE BOX 655303

functional description (continued)

1234567Figure 1Figure 2Figure 38

IRQ0

INTD

– – –

Start Frame

RR

R

TT

T

SS

PCLK

ACTIVE

PCI950

IRQSER

DRIVE

Stop Frame

RT

(see Note 9)

(see Note 10)

PCI950

Legend:

R = Recovery

S = Sample

T = Turnaround

NOTES:

9. ACTIVE goes low one clock cycle after the beginning of the PCI950 start pulse.

10. ACTIVE is set high two clock pulses after the PCI950 stop pulse.

Figure 4. ACTIVE Output Timing During Quiet Mode

ACTIVE

Stop Frame

RT

PCLK

STOP

Stop Frame

RT

PCI950

IRQSER

DRIVE

PCI950

16 Clocks

Legend:

R = Recovery

T = Turnaround

(See Notes 11 and 12)

NOTES: 11. STOP can only be used to insert idle states in continuous mode.

12. The recommended sequence for using SHUTD is to:

A. Assert STOP.

B. Ensure that ACTIVE is not asserted.

C. Assert SHUTD.

Figure 5. Using STOP During Continuous Mode