GS1560A Gennum Corporation, GS1560A Datasheet - Page 50

• Manufacturer Part Number: GS1560A
• Description: Reclocking Deserializer For HD-SDI, Sd-sdi & Dvb-asi With Loop Thru Cable Driver. 3.3/1.8V Supply.
• Manufacturer: Gennum Corporation

3.12.1 Command Word Description
The command word is transmitted MSB first and contains a
read/write bit, nine reserved bits and a 6-bit register
address.
Command words are clocked into the GS1560A on the
rising edge of the serial clock SCLK. The appropriate chip
3.12.2 Data Read and Write Timing
Read and write mode timing for the GSPI interface is shown
in Figures 16 and 17 respectively. The maximum SCLK
frequency allowed is 6.6MHz.
When writing to the registers via the GSPI, the MSB of the
data word may be presented to SDIN immediately following
SDIN
GENNUM CORPORATION
SDOUT
SDIN
SCLK
SCLK
CS
CS
R/W
R/W
MSB
MSB
t
RSV
0
t
RSV
0
D15
R/W
RSV
RSV
RSV
RSV
D14
RSV
RSV
RSV
t
RSV
3
t
RSV
3
D13
RSV
input data
setup time
RSV
input data
setup time
RSV
RSV
RSV
D12
RSV
t
2
t
2
RSV
RSV
duty
cycle
duty
cycle
RSV
D11
RSV
RSV
Fig. 13 Gennum Serial Peripheral Interface (GSPI)
Application Host
A5
A5
RSV
A4
D10
A4
SDOUT
Fig. 16 GSPI Read Mode Timing
SCLCK
Fig. 17 GSPI Write Mode Timing
SDIN
t
4
A3
A3
CS
Fig. 14 Command Word
RSV
D9
A2
Fig. 15 Data Word
period
A2
t
4
A1
50 of 55
A1
RSV
D8
period
A0
A0
select, CS, signal must be asserted low a minimum of 1.5ns
(t
ensure proper operation.
Each command word must be followed by only one data
word to ensure proper operation.
the falling edge of the LSB of the command word. All SDIN
data is sampled on the rising edge of SCLK.
When reading from the registers via the GSPI, the MSB of
the data word will be available on SDOUT 12ns following
the falling edge of the LSB of the command word, and thus
may be read by the host on the very next rising edge of the
clock. The remaining bits are clocked out by the GS1560A
on the negative edges of SCLK.
D15
0
RSV
D15
D7
t
5
in Figures 16 and 17) before the first clock edge to
D14
D14
SCLCK
SDIN
CS
SDOUT
D13
RSV
D13
D6
D12
GS1560A
D12
D11
A5
D5
D11
D10
t
D10
6
A4
D4
D9
output data
hold time
D9
D8
D8
A3
D3
D7
D7
D6
D6
A2
D2
D5
D5
D4
D4
A1
D1
D3
D3
D2
A0
D0
D2
LSB
LSB
D1
27360-1
D1
D0
D0