32579BElectrical Specifications

Table 9-19. ACCESS.bus Output Timing Parameters (Continued)

Symbol

Parameter

Min

Max

Unit

Comments

 

 

 

 

 

 

tSDAfo

AB1D/AB2D signal fall

 

300

ns

 

 

time

 

 

 

 

 

 

 

 

 

 

tSDAro

AB1D/AB2D signal rise

 

1

μs

 

 

time

 

 

 

 

 

 

 

 

 

 

tSDAho

AB1D/AB2D hold time

7 * tCLK - tSCLfo

 

 

After AB1C/AB2C falling edge

tSDAvo

AB1D/AB2D valid time

 

7 * tCLK + tRD

 

After AB1C/AB2C falling edge

Note 1. K is determined by bits [7:1] of the ACBCTL2 register (LDN 05h/06h, Offset 05h).

Note 2. tSCLhigho value depends on the signal capacitance and the pull-up value of the relevant pin.

AB1D

0.7VIO

 

 

0.7VIO

 

 

AB2D

0.3VIO

 

 

0.3VIO

 

 

 

tSDAr

 

 

 

tSDAf

 

 

 

AB1C

0.7VIO

 

 

0.7VIO

 

 

0.3VIO

 

 

0.3VIO

 

 

 

AB2C

tSCLr

 

 

 

tSCLf

 

 

 

Figure 9-9. ACB Signals: Rising and Falling Timing Diagram

Stop Condition

Start Condition

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AB1D

AB2D

tDLCs tDLCo

AB1C

AB2C

tCSTOsi tCSTOso

tBUFi tBUFo

tCSTRhi tCSTRho

Figure 9-10. ACB Start and Stop Condition Timing Diagram

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AMD Geode™ SC1200/SC1201 Processor Data Book

Page 386
Image 386
AMD SC1200, SC1201 manual AB1D AB2D, AB1C AB2C