CMX644AD2 View Datasheet(PDF) - MX-COM Inc
Part Name
Description
MFG CO.
'CMX644AD2' PDF : 31 Pages View PDF
Bell 212A / V.22 Modem with Call Progress and DTMF
30
6.1.4.2 C-BUS Timing
‘C-BUS’ Timings (See Figure 15)
tCSE
CS -Enable to Clock-High time
tCSH
Last Clock-High to CS -High time
tLOH
Clock-Low to Reply Output enable time
tHIZ
CS -High to Reply Output 3-state time
tCSOFF CS -High Time between transactions
tNXT
Inter-Byte time
tCK
Clock-Cycle time
tCH
Serial Clock-High time
tCL
Serial Clock-Low time
tCDS
Command Data Set-Up time
tCDH
Command Data Hold time
tRDS
Reply Data Set-Up time
tRDH
Reply Data Hold time
Notes
Min.
100
100
0
1.0
200
200
100
100
75
25
75
0
CMX644A Preliminary Information
Typ.
Max.
1.0
Units
ns
ns
ns
µs
µs
ns
ns
ns
ns
ns
ns
ns
ns
Note: These timings are for the latest version of the ‘C-BUS’ as embodied in the CMX644A, and allow faster
transfers than the original ‘C-BUS’ timings provided in MX-COM’s Publication Doc. # 20480060.001.
Table 30 ‘C-BUS’ Timings
CS
tCSE
SERIAL CLOCK
tCK
tNXT
tCSH
tCSOFF
COMMAND DATA
765432 10
tLOZ
REPLY DATA
HI-Z
765432 10
tHIZ
765432 10
= Level not important or undefined
70% VDD
30% VDD
COMMAND
DATA
tCL
tCDS
tCH
tCDH
SERIAL
CLOCK
REPLY
DATA
tCK
tRDS
tRDH
Figure 15: ‘C-BUS’ Timing
2000 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480197.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
Share Link: 
