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S1D13504 Hardware Functional Specification
X19A-A-002-18 Issue Date: 01/01/30
11.2 Frame Rate Calculation

The frame rate is calculated using the following formula:

Where:

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
= in table below
HDP = Horizontal Display Period = ((REG[04h] bits [6:0]) + 1) * 8Ts
HNDP = Horizontal Non-Display Period = ((REG[05h] bits [4:0]) + 1) * 8Ts
= given in table below
Ts = Pixel Clock = PCLK
Table 11-3: Example Frame Rates
DRAM Type1
(Speed Grade) Display Resolution Color
Depth
(bpp)
Maximum
Pixel
Clock
(MHz)
Minimum
Panel
HNDP(Ts)
Maximum Frame
Rate (Hz)
Panel4CRT
50ns
EDO-DRAM
MClk = 40MHz
NRC = 4
NRP = 1.5
NRCD = 2
Single Panel.
• CRT.
Dual Monochrome/Color Panel
with Half Frame Buffer Disabled.5
Simultaneous CRT + Single Panel.
Simultaneous CRT + Dual
Monochrome/Color Panel with Half
Frame Buffer Disabled.5
800x60021/2/4/8
40
32 80 60
16 56 78 60
640x480 1/2/4/8 32 123 85
16 56 119 85
640x240 1/2/4/8 32 247 -
16 56 242 -
480x320 1/2/4/8 32 243 -
16 56 232 -
320x240 1/2/4/8 32 471 -
16 56 441 -
Dual Color with Half Frame Buffer
Enabled.
Dual Mono with Half Frame Buffer
Enabled.
800x6002,3 1/2/4/8 20 32 80 -
16 13.3 32 53 -
640x480 1/2/4/8 20 32 123 -
16 13.3 32 82 -
FrameRate PCLKmax
HDP HNDP+()VDP VNDP+()×
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