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S1D13504 Hardware Functional Specification
X19A-A-002-18 Issue Date: 01/01/30
7.4.13 CRT Timing

Figure 7-39: CRT Timing

VDP = Vertical Display Period = (REG[09h] bits [1:0], REG[08h] bits [7:0]) + 1
VNDP = Vertical Non-Display Period = (REG[0Ah] bits [5:0]) + 1

HDP = Horizontal Display Period = ((REG [04h] bits [6:0]) + 1)*8Ts

HNDP = Horizontal Non-Display Period = HNDP1 + HNDP2= ((REG[05h] bits [4:0]) + 1)*8Ts

VRTC
HRTC
LINE1 LINE480
1-1 1-2 1-640
HRTC
DACCLK
BLANK#
DACP[7:0]
DACD[7:0]
VDP
HDP
VNDP
HNDP1
BLANK#
Example Timing for 640x480 CRT
HNDP2
LINE480