32580B

Electrical Specifications

9.3.4ACCESS.bus Interface

The following tables describe the timing for the ACCESS.bus signals.

Notes: 1) All ACCESS.bus timing is not 100% tested.

2) In this table tCLK = 1/24 MHz = 41.7 ns.

Table 9-16. ACCESS.bus Input Timing Parameters

Symbol

Parameter

Min

Max

Unit

Comments

 

 

 

 

 

 

tBUFi

Bus free time between

tSCLhigho

 

 

 

 

Stop and Start condition

 

 

 

 

 

 

 

 

 

 

tCSTOsi

AB1C/AB2C setup time

8 * tCLK - tSCLri

 

 

Before Stop condition

tCSTRhi

AB1C/AB2C hold time

8 * tCLK - tSCLri

 

 

After Start condition

tCSTRsi

AB1C/AB2C setup time

8 * tCLK - tSCLri

 

 

Before Start condition

tDHCsi

Data high setup time

2 * tCLK

 

 

Before AB1C/AB2C rising edge

tDLCsi

Data low setup time

2 * tCLK

 

 

Before AB1C/AB2C rising edge

tSCLfi

AB1D/AB2D fall time

 

300

ns

 

tSCLri

AB1D/AB2D rise time

 

1

μs

 

tSCLlowi

AB1C/AB2C low time

16 * tCLK

 

 

After AB1C/AB2C falling edge

tSCLhighi

AB1C/AB2C high time

16 * tCLK

 

 

After AB1C/AB2C rising edge

tSDAfi

AB1D/AB2D fall time

 

300

ns

 

tSDAri

AB1D/AB2D rise time

 

1

μs

 

tSDAhi

AB1D/AB2D hold time

0

 

 

After AB1C/AB2C falling edge

tSDAsi

AB1D/AB2D setup time

2 * tCLK

 

 

Before AB1C/AB2C rising edge

Table 9-17. ACCESS.bus Output Timing Parameters

Symbol

Parameter

Min

Max

Unit

Comments

 

 

 

 

 

 

tSCLhigho

AB1C/AB2C high time

K * tCLK - 1 μs

 

 

After AB1C/AB2C rising edge,

 

 

 

 

 

Note 1

 

 

 

 

 

 

tSCLlowo

AB1C/AB2C low time

K * tCLK - 1 μs

 

 

After AB1C/AB2C falling edge

tBUFo

Bus free time between

tSCLhigho

1

μs

Note 2

 

Stop and Start condition

 

 

 

 

 

 

 

 

 

 

tCSTOso

AB1C/AB2C setup time

tSCLhigho

1

μs

Before Stop condition, Note 2

tCSTRho

AB1C/AB2C hold time

tSCLhigho

1

μs

After Start condition, Note 2

tCSTRso

AB1C/AB2C setup time

tSCLhigho

1

μs

Before Start condition, Note 2

tDHCso

Data high setup time

tSCLhigho - tSDAro

1

μs

Before AB1C/AB2C rising

 

 

 

 

 

edge, Note 2

 

 

 

 

 

 

tDLCso

Data low setup time

tSCLhigho - tSDAfo

1

μs

Before AB1C/AB2C rising

 

 

 

 

 

edge, Note 2

 

 

 

 

 

 

tSCLfo

AB1D/AB2D signal fall

 

300

ns

 

 

time

 

 

 

 

 

 

 

 

 

 

tSCLro

AB1D/AB2D signal rise

 

1

μs

 

 

time

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

388

 

 

 

AMD Geode™ SC2200 Processor Data Book

Page 370
Image 370
AMD SC2200 manual ACCESS.bus Input Timing Parameters, ACCESS.bus Output Timing Parameters