Epson Research and Development

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13.3 Power Save Mode Function Summary

Table 13-1: Power Save Mode Function Summary

 

 

Power Save Mode (PSM)

Function

 

 

 

 

Normal

 

Software

Hardware

 

(Active)

 

Suspend

Suspend

 

 

 

 

 

Display Active?

Yes

 

No

No

 

 

 

 

 

Register Access Possible?

Yes

 

Yes (1)

No

 

 

 

 

 

Memory Access Possible?

Yes

 

No

No

 

 

 

 

 

Host Bus Interface Running?

Yes

 

Yes

No

 

 

 

 

 

Memory Interface Running?

Yes

 

No (2)

No (2)

 

 

 

 

 

Note

(1)except for RAMDAC registers.

(2)Yes if CBR suspend mode refresh is selected.

13.4Pin States in Power Save Modes

Table 13-2: Pin States in Power Save Modes

 

 

 

Pin State

 

 

Pins

 

 

 

 

Normal

Software

Hardware

 

 

 

(Active)

Suspend

Suspend

 

 

 

 

 

 

 

LCD outputs

 

Active

Forced Low (1)

Forced Low (1)

 

 

 

 

 

 

 

LCDPWR

 

On

Off

Off

 

 

 

 

 

 

 

DRAM outputs

 

Active

Refresh Only (2)

Refresh Only (2)

 

 

 

 

 

 

CRT / DAC outputs

Active

Disabled (3)

Disabled (3)

 

 

 

 

 

 

Host Interface outputs

Active

Active (4)

Disabled

 

 

 

 

 

 

 

Note

 

 

 

 

 

1.

FPFRAME and FPLINE are forced to their inactive states as defined by REG[0Ch] bit 6

 

and REG[07h] bit 6 respectively.

 

 

 

2.

Selectable: may be CBR refresh, self-refresh or no refresh at all.

3.

DACWR#, DACRD#, DACRS0, DACRS1 are active but DACCLK is disabled.

4.

Active for non-DAC register access only.

 

 

Hardware Functional Specification

S1D13504

Issue Date: 01/01/30

X19A-A-002-18

Page 135
Image 135
Epson S1D13504 manual Power Save Mode Function Summary, Pin States in Power Save Modes, Power Save Mode PSM