M69030 Asiliant Technologies, M69030 Datasheet - Page 143

• Manufacturer Part Number: M69030
• Manufacturer: Asiliant Technologies

Specifications of M69030

• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 70C
• Rad Hardened: No
• Lead Free Status / Rohs Status: Supplier Unconfirmed

CR74
read/write at I/O address 3B5h/3D5h with index at address 3B4h/3D4h set to 74h
shadowed only for pipeline B
7-6
5
4-0
`efmp
A
B

Reserved
NTSC/PAL Horizontal Pulse Width Round Off Control
NTSC/PAL Horizontal Equalization Pulse Width
69030 Databook
7
Reserved
NTSC/PAL Horizontal Pulse Width Register
0: Enables the generation of horizontal equalization pulses with a width that is
approximately equal to half the width of the horizontal sync pulse. The actual width is
determined using bits 4-0 of this register.
1: Disables the generation of horizontal equalization pulses.
These 5 bits specify the pulse width of the horizontal equalization pulse used to generate
the NTSC/PAL-compliant composite sync. Normally, the width of this horizontal
equalization pulse is approximately half the width of the horizontal sync pulse.
These 5 bits should be programmed with a value equal to the actual pulse width, subtracted
by 1. The width of the actual equalization pulse can be calculated as follows:
6
equalization pulse width - 1 = (CR74[4:0] - CR74[5]) ÷ 2
Round Off
5
CRT Controller Registers
4
reserved
NTSC/PAL Horizontal Equalization Pulse Width
3
2
Revision 1.3 11/24/99
1
0
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