32580B

Electrical Specifications

9.3.3CRT and TFT Interface

Table 9-19and Figure 9-7describe the timing of the digital CRT interface of the SC2200. All measurement points in this table are identical to the voltage measurement levels described in Table 9-16 on page 384.

Note that signals DDC_SCL and DDC_SDA of the CRT interface are compliant with standard ACCESS.bus timing and are controlled by software.

Table 9-14. TFT Timing Parameters

Symbol

Parameter

Min

 

Max

Unit

Comments

 

 

 

 

 

 

 

tOV

TFTD[17:0], TFTDE valid time after TFTDCK rising

0

 

8

ns

 

 

edge (multiplexed on IDE)

 

 

 

 

 

 

 

 

 

 

 

 

tOV

TFTD[17:0], TFTDE valid time after TFTDCK rising

0

 

4

ns

 

 

edge (multiplexed on Parallel Port)

 

 

 

 

 

 

 

 

 

 

 

 

tCLK_RF

TFTDCK rise/fall time between 0.8V and 2.0V

 

 

3

ns

Note 1

tCLK_P

TFTDCK period time (multiplexed on IDE)

25

 

 

ns

 

tCLK_P

TFTDCK period time (muxed on Parallel Port)

12.5

 

 

ns

 

tCLK_D

TFTDCK duty cycle

 

40/60

%

 

Note 1. Guaranteed by characterization

tCLK_P

tOV

TFTDCK

tCLK_RF

TFTD[17:0]

TFTDE

Figure 9-7. TFT Timing Diagram

386

AMD Geode™ SC2200 Processor Data Book

Page 368
Image 368
AMD SC2200 manual CRT and TFT Interface, TFT Timing Parameters