74377: Difference between revisions
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*Q0-7: Outputs, connected to PRG and CHR ROM address lines | *Q0-7: Outputs, connected to PRG and CHR ROM address lines | ||
D0-7 are copied to Q0-7 when CLK rises (0 to 1) while /WE is low. | D0-7 are copied to Q0-7 when CLK rises (0 to 1) while /WE is low. | ||
== References == | |||
*Philips Semiconductors. [http://www.alldatasheet.com/datasheet-pdf/pdf/15594/PHILIPS/74HC377.html 74HC377: Octal D-type flip-flop with data enable; positive-edge trigger] | |||
Revision as of 16:12, 27 November 2010
The 74377 chip is used as a latch in mappers like Color Dreams and stores eight bits of data.
74HC377
Octal D flip-flop
,---_---.
/WE -| 1 20|- Vcc
Q0 -| 2 19|- Q7
D0 -| 3 18|- D7
D1 -| 4 17|- D6
Q1 -| 5 16|- Q6
Q2 -| 6 15|- Q5
D2 -| 7 14|- D5
D3 -| 8 13|- D4
Q3 -| 9 12|- Q4
GND -|10 11|- CLK
`-------'
- Vcc: Connect to +5V
- GND:
- CLK: Load clock
- /WE: Write enable
- D0-7: Inputs, connected to CPU D0-D7
- Q0-7: Outputs, connected to PRG and CHR ROM address lines
D0-7 are copied to Q0-7 when CLK rises (0 to 1) while /WE is low.
References
- Philips Semiconductors. 74HC377: Octal D-type flip-flop with data enable; positive-edge trigger
