CMX813 View Datasheet(PDF) - MX-COM Inc
Part Name
Description
Manufacturer
CMX813 Datasheet PDF : 19 Pages
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CMX813 Multi-Standard Analog Paging Decoder
18
7.1.4 Timing
C-BUS Timings (See Figure 3 and Note 5)
tCSE
CS -Enable to Clock-High time
tCSH
Last Clock-High to CS -High time
tLOZ
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
CMX813 Advance Information
Notes Min. Typ. Max. Unit
100
-
-
ns
100
-
-
ns
0.0
-
-
ns
-
-
1.0 µs
1.0
-
-
µs
500
-
500
-
200
-
200
-
75
-
-
ns
-
ns
-
ns
-
ns
-
ns
25
-
75
-
0
-
-
ns
-
ns
-
ns
CS
tCSE
tCK
tNXT
SERIAL CLOCK
tCSH
tCSOFF
COMMAND DATA
REPLY DATA
765432 10
tLOZ
HI-Z
765432 10
tHI Z
765432 10
= Level not important or undefined
70% VDD
30% VDD
COMMAND
DATA
tCL
tCDH
tCH
tCDH
SERIAL
CLOCK
REPLY
DATA
tCK
tRDS
tRDH
Figure 3: C-BUS Timing
Notes:
1. Depending on the command, 1 or 2 bytes of COMMAND DATA are transmitted to the
peripheral MSB (Bit 7) first, LSB (Bit 0) last. REPLY DATA is read from the peripheral MSB (Bit 7) first,
LSB (Bit 0) last.
2. Data is clocked into and out of the peripheral on the rising SERIAL CLOCK edge.
3. Loaded commands are acted upon at the end of each command.
4. To allow for differing µController serial interface formats C-BUS compatible ICs are able to work with
either polarity SERIAL CLOCK pulses.
5. These timings are for the latest version of the C-BUS as embodied in the CMX813, and allow faster
transfers than the original C-BUS timings given in MX-COM’s Publication Doc. # 20480060.001.
¤2000 MX-COM, Inc.
www.mxcom.com tel: 336 744 5050 800 638 5577 fax: 336 744 5054
Doc. # 20480220.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201, USA All trademarks and service marks are held by their respective customers.
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