32580B

Electrical Specifications

 

 

t0

ADDR valid1

t1

 

t2

 

t9

t2i

IDE_IOR0#

IDE_IOW0#

WRITE IDE_DATA[7:0]

t3 t4

READ

IDE_DATA[7:0]

t5 t6

IDE_IORDY02,3

t6z

 

 

 

tA

IDE_IORDY02,4

tC

IDE_IORDY02,5

tRD

tBtC

Notes:

1)Device address consists of signals IDE_CS[0:1]# and IDE_ADDR[2:0].

2)Negation of IDE_IORDY0,1 is used to extend the PIO cycle. The determination of whether or not the cycle is to be extended is made by the host after tA from the assertion of IDE_IOR[0:1]# or IDE_IOW[0:1]#.

3)Device never negates IDE_IORDY[0:1]. Device keeps IDE_IORDY[0:1] released, and no wait is generated.

4)Device negates IDE_IORDY[0:1] before tA but causes IDE_IORDY[0:1] to be asserted before tA. IDE_IORDY[0:1] is released, and no wait is generated.

5)Device negates IDE_IORDY[0:1] before tA. IDE_IORDY[0:1] is released prior to negation and may be asserted for no more than 5 ns before release. A wait is generated.

6)The cycle completes after IDE_IORDY[0:1] is reasserted. For cycles where a wait is generated and IDE_IOR[0:1] is asserted, the device places read data on IDE_DATA[15:0] for tRD before asserting IDE_IORDY[0:1].

Figure 9-24. Register Transfer to/from Device Timing Diagram

404

AMD Geode™ SC2200 Processor Data Book

Page 386
Image 386
AMD SC2200 manual Addr valid1, IDEIOR0# IDEIOW0# Write IDEDATA70, Read IDEDATA70, IDEIORDY0 2,3, IDEIORDY02,4 IDEIORDY02,5