XRT75R03D_06 Datasheet, PDF (43/135 Pages) Exar Corporation – EXAR DATA SHEET FORMAT TEMPLATES

REV. 1.0.4
FIGURE 11. MICROPROCESSOR SERIAL INTERFACE STRUCTURE
CS
XRT75R03D
THREE CHANNEL E3/DS3/STS-1 LINE
SClk
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
SDI
SDO
R/W A0 A1 A2 A3 A4 A5 0 D0 D1 D2 D3 D4 D5 D6 D7
High Z
High Z
D0 D1 D2 D3 D4 D5 D6 D7
NOTE: If the R/W bit is set to "1", then this denotes a "READ" operation with the Microprocessor Serial Interface.
Conversely, if the R/W bit is set to "0", then this denotes a "WRITE" operation.
FIGURE 12. TIMING DIAGRAM FOR THE MICROPROCESSOR SERIAL INTERFACE
CS
SCLK
SDI
t
21
t
22
t
23
R/W
t
26
t
24
t
25
A0
A1
t
28
t
27
CS
SCLK
t
29
t
30
SDO _Hi-Z
D0
D1
Hi-Z
SDI
t
32
D2
t
31
D7
TABLE 8: MICROPROCESSOR SERIAL INTERFACE TIMINGS ( T_A = 25⁰C, V_DD=3.3V± 5% AND LOAD = 10PF)
SYMBOL
PARAMETER
MIN.
TYP.
MAX
UNITS
t₂₁ CS Low to Rising Edge of SClk
5
ns
t₂₂ SDI to Rising Edge of SClk
5
ns
t₂₃ SDI to Rising Edge of SClk Hold Time
5
ns
39