388 AMD Geode™ SC2200 Processor Data Book
Electrical Specifications
32580B
9.3.4 ACCESS.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
Stop and Start condition
tSCLhigho
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
Stop and Start condition
tSCLhigho 1 μs Note 2
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
time
300 ns
tSCLro AB1D/AB2D signal rise
time
1 μs