32579B

Electrical Specifications

9.3.3CRT and TFT Interface

Table 9-15and Figure 9-8describe the timing of the digital CRT interface of the SC1200/SC1201 processor. All mea- surement points in this table are identical to the voltage measurement levels described in Table 9-11 on page 376.

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 9-15. TFT Timing Parameters

Symbol

Parameter

Min

 

Max

Unit

Comments

 

 

 

 

 

 

 

tOV

TFTD[17:0], TFTDE valid time after

0

 

8

ns

 

 

TFTDCK rising edge (multiplexed on IDE)

 

 

 

 

 

 

 

 

 

 

 

 

tOV

TFTD[17:0], TFTDE valid time after

0

 

4

ns

 

 

TFTDCK rising edge (multiplexed on

 

 

 

 

 

 

Parallel Port)

 

 

 

 

 

 

 

 

 

 

 

 

tCLK_RF

TFTDCK rise/fall time between 0.8V and

 

 

3

ns

Note 1

 

2.0V

 

 

 

 

 

 

 

 

 

 

 

 

tCLK_P

TFTDCK period time (multiplexed on IDE)

25

 

 

ns

 

tCLK_P

TFTDCK period time (multiplexed on

12.5

 

 

ns

 

 

Parallel Port)

 

 

 

 

 

 

 

 

 

 

 

 

tCLK_D

TFTDCK duty cycle

 

40/60

%

 

Note 1. Guaranteed by characterization.

tCLK_P

tOV

TFTDCK

tCLK_RF

TFTD[17:0]

TFTDE

Figure 9-8. TFT Timing Diagram

382

AMD Geode™ SC1200/SC1201 Processor Data Book

Page 382
Image 382
AMD SC1200, SC1201 manual CRT and TFT Interface, TFT Timing Parameters