IDT
TM
/ICS
TM
DDR I/DDR II Phase Lock Loop Zero Delay Buffer ICS9P935 REV H 12/1/08
ICS9P935
DDR I/DDR II Phase Lock Loop Zero Delay Buffer
10
Table 1: 7-Steps Skew Programming Table
7 Step 11 10 01 00 LSB
11
600 ps 500 ps 400 ps 300 ps
10
N/A N/A N/A 200 ps
01
N/A N/A N/A 100 ps
00
N/A N/A N/A 0.0 ps
MSB
Table 2: 7-Steps Skew Programming Table
7 Step 11 10 01 00 LSB
11
-600 ps -500 ps -400 ps -300 ps
10
N/A N/A N/A -200 ps
01
N/A N/A N/A -100 ps
00
N/A N/A N/A 0.0 ps
MSB
I
2
C Table: Output Control Register
Pin # Name Control Function Type 0 1 PWD
Bit 7
Freq Detect
Low Frequency Detect
PLL OFF Control
RW OFF ON 1
Bit 6
FB_IN/OUT FB_OUT Control RW Disable Enable 1
Bit 5
DDR_T5/C5 Output Control RW Disable Enable 1
Bit 4
DDR_T4/C4 Output Control RW Disable Enable 1
Bit 3
DDR_T3/C3 Output Control RW Disable Enable 1
Bit 2
DDR_T2/C2 Output Control RW Disable Enable 1
Bit 1
DDR_T1/C1 Output Control RW Disable Enable 1
Bit 0
DDR_T0/C0 Output Control RW Disable Enable 1
I
2
C Table: Group Skew Control Register
B
te 8 Pin # Name Control Function T
e0 1PWD
Bit 7
- DDR Skw3 RW 0
Bit 6
- DDR Skw2 RW 0
Bit 5
- DDR Skw1 RW 0
Bit 4
- DDR Skw0 RW 0
Bit 3
- DDR Skw3 RW 0
Bit 2
- DDR Skw2 RW 0
Bit 1
- DDR Skw1 RW 0
Bit 0
- DDR Skw0 RW 0
I
2
C Table: Revision ID and Vendor ID Register
B
te 10 Pin # Name Control Function T
e0 1PWD
Bit 7
- Rev is ion_ID bit 3 RW - - X
Bit 6
- Rev is ion_ID bit 2 RW - - X
Bit 5
- Rev is ion_ID bit 1 RW - - X
Bit 4
- Rev is ion_ID bit 0 RW - - X
Bit 3
- Vendor_ID bit3 RW -
-
0
Bit 2
- Vendor_ID bit2 RW
--
0
Bit 1
- Vendor_ID bit1 RW
--
0
Bit 0
- Vendor_ID bit0 RW
--
1
I
2
C Table: Byte Count Register
Byte 15 Pin # Name Control Function Type 0 1 PWD
Bit 7
-BC7 RW 0
Bit 6
-BC6 RW 0
Bit 5
-BC5 RW 0
Bit 4
-BC4 RW 0
Bit 3
-BC3 RW 1
Bit 2
-BC2 RW 1
Bit 1
-BC1 RW 1
Bit 0
-BC0 RW 1
I2C Table: All other I2C Registers are Reserved
See Table 2: 7-Step Skew
Programming Table
CLKIN to DDR
Skew Control
Byte 6
-
-
-
-
Byte Count
Programming b(7:0)
Writing to this register will
configure how many bytes
will be read back, default is
0F = 15 bytes
-
-
CLKIN to DDR
Skew Control
-
-
Rev ID
Vendor ID
See Table 1: 7-Step Skew
Programming Table
