GS2972 Datasheet, PDF (89/125 Pages) Semtech Corporation – 3G/HD/SD-SDI Serializer with Complete SMPTE Audio & Video Support

4.13.3 GSPI Timing
Write and Read Mode timing for the GSPI interface is as shown in the following
diagrams:
t
t
0
1
SCLK_TCK
t
3
CS_TMS
t
t
2
8
SDIN_TDI
R/W
RSV
RSV
Auto
_Inc
A11 A10
A9
A8
A7 A6 A5
A4
A3 A2
A1 A0
SDOUT_TDO
Auto
R/W RSV RSV _{_Inc} A11 A10 A9 A8
A7 A6 A5
A4 A3 A2 A1
A0
Figure 4-32: Write Mode
t
t
4
7
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
SCLK_TCK
CS_TMS
t
5
t
6
SDIN_TDI
R/W RSV
RSV
Auto
_Inc
A11
A10 A9
A8
A7
A6 A5
A4
A3 A2
A1
A0
SDOUT_TDO
R/W RSV
RSV
Auto
_Inc
A11
A10
A9
A8
A7
A6 A5
A4
A3
A2
A1 A0
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Figure 4-33: Read Mode
SDIN_TDI to SDOUT_TDO combinational path for daisy chain connection of multiple GS2972 devices.
SDIN_TDI
SDOUT_TDO
TDELAY
data_0
data_0
Figure 4-34: GSPI Time Delay
Table 4-32: GSPI Time Delay
Parameter
Delay time
Delay time
Symbol
t_DELAY
t_DELAY
Conditions
Min Typ Max Units
50% levels;
+1.8V operation
−
50% levels;
+3.3V operation
−
−
10.5
ns
−
8.7
ns
GS2972 3G/HD/SD-SDI Serializer with Complete
SMPTE Audio & Video Support
Final Data Sheet Rev. 9
GENDOC-047479 September 2013
www.semtech.com
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