December 2006
6-45
WorkCentre M20, 4118, FaxCentre 2218 Family
GP 13
General Procedures and Information
AC Characteristics
Refer to Figure 2 and Figure 3.
Figure 2 Program operation timings
NOTE: 1. PA= program address, PD= program data, Dout is the true data at the program
address.
NOTE: 2. Figure 2 shows device in word mode.
Figure 3 BYTE# timings for write operations
USB (Universal Serial Bus)
NS’s USBN9602 is used as the interface IC and 48MHz clock is used. When the data is
received through the USB port, EIRQ1 SIGNAL is activated to send interrupt to the CPU, then
it directly sends the data to DRAM by IOCS4*&DRAMA (11) SIGNAL through DRAMD (24;31).
SRAM
For details, refer to the relevant sections:
• M20F 1MBYTE SRAM K6F1008U2C
• 4118 1MBYTE SRAM K6R1016VID
M20F 1MBYTE SRAM K6F1008U2C
It stores a variety of option data.
4118 1MBYTE SRAM K6R1016VID
It is used for image processing only.
FAX
For details, refer to the relevant sections:
• M20 FAX Transceiver
• 4118/2218 SmartDAA FAX Technology
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