saa5355 NXP Semiconductors, saa5355 Datasheet - Page 27

• Manufacturer Part Number: saa5355
• Description: Single-chip Colour Crt Controller Ftfrom
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Disconnected systems
For many applications it may be desirable to disconnect FTFROM and the display memory from the microprocessor and
its ROM, RAM and other peripherals by using isolating buffers as shown in Fig.23. The two parts of the system then
operate independently and communicate only when the microprocessor accesses FTFROM’s register map or the display
memory.
March 1986
Single-chip colour CRT controller
(FTFROM)
(1) 74LS373 octal transparent latch (3-state)
(2) 74LS244 octal buffer (3-state)
(3) 74LS245 octal bus transceiver (3-state)
Fig.23 Disconnected 8-bit system.
27
Product specification
SAA5355