DATASHEET
RD890 SYSTEM CLOCK FOR AMD-BASED SERVERS
932S890C
IDT
RD890 SYSTEM CLOCK FOR AMD-BASED SERVERS
1
932S890C
REV D 052011
General Description
The 932S890C is a main clock synthesizer chip for
SR5690/SR5670 AMD Servers. An SMBus interface allows
full control of the device.
Recommended Application
SR5690/SR5670 AMD-based Servers
Output Features
Low power differential outputs with integrated series
resistors for Zo=50ohm systems
4 -Differential 200MHz CPU pairs
2 - Differential 100MHz HT3 pairs
14 - Differential PCIe Gen2 SRC pairs
1 - Differential non-spread SATA clock
2 - 48MHz USB clocks (180 degrees out of phase for EMI
reduction)
2 - SIO clocks (selectable 48MHz or 24MHz). 180
degrees out of phase for EMI reduction
2 - 14.318MHz REF clock outputs
Features/Benefits
Spread Spectrum; EMI reduction
Outputs may be disabled via SMBus; saves power
External crystal load capacitors; maximum frequency
accuracy
Key Specifications
CPU output cycle-to-cycle jitter <100ps
SRC output cycle-to-cycle jitter <125ps
48MHz output cycle-to-cycle jitter <130ps
SIO output cycle-to-cycle jitter <150ps
SRC output phase jitter <3.1ps rms (PCIe Gen2)
+/- 50ppm frequency accuracy on all clocks, assuming
REF is trimmed to 0 ppm)
Pin Configuration
Table 1: 932S890 Functionality
CPU
MHz
HTT
MHz
SR C
MHz
SATA
REF
MHz
SIO
USB
MHz
DOT
MHz
200.00
100.00
14.318
24/48
48.00
96.00
S
R
C
13T
_LP
R
S
SR
C
1
3
C
_
L
P
R
S
R
C
12T
_
L
P
R
S
SR
C
1
2
C
_
L
PR
S
V
D
DS
RC
_
3
.3
GN
D
S
R
C
S
R
C
11T
_
L
P
R
S
SR
C
1
C
_
L
PR
S
R
C
1
0T
_LP
R
S
R
C
1
0
C
_LP
R
S
R
C9
T
_
L
P
RS
S
R
C
9
C_
L
P
RS
GN
D
S
R
C
V
D
S
R
C
_3.3
S
R
C8
T
_
L
P
RS
S
R
C
8
C_
L
P
RS
S
R
C7
T
_
L
P
RS
S
R
C7
C_
L
P
RS
72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55
VDDSATA_3.3 1
54 SRC6T_LPRS
SATAC_LPRS 2
53 SRC6C_LPRS
SATAT_LPRS 3
52 SRC5T_LPRS
GNDSATA 4
51 SRC5C_LPRS
CPUKG0C_LPRS 5
50 VDDSRC_3.3
CPUKG0T_LPRS 6
49 GNDSRC
CPUKG1C_LPRS 7
48 SRC4T_LPRS
CPUKG1T_LPRS 8
47 SRC4C_LPRS
VDDCPU _3.3 9
46 SRC3T_LPRS
GN DCPU 10
45 SRC3C_LPRS
CPUKG2C_LPRS 11
44 SRC2T_LPRS
CPUKG2T_LPRS 12
43 SRC2C_LPRS
CPUKG3C_LPRS 13
42 GNDSRC
CPUKG3T_LPRS 14
41 VDDSRC_3.3
RESTORE# 15
40 SRC1T_LPRS
HTT0C_LPRS 16
39 SRC1C_LPRS
HTT0T_LPRS 17
38 SRC0T_LPRS
GNDH TT 18
37 SRC0C_LPRS
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
V
D
H
T
_3.
3
HT
T
1
C_
L
P
RS
H
TT1
T_
L
P
R
S
SM
BC
L
K
SM
BD
A
T
X1
X2
VD
D
R
E
F
_
3
.3
RE
F
0
RE
F
1
GN
D
R
E
F
G
ND4
8
48
M
H
z
_
0
48
M
H
z
_
1
V
D
48_3
.3
S
IO
_
0
_
1.
8/S
IO
_
S
E
S
IO
_1_1
.8
GN
D
S
IO
* Indicates that pin has 120Kohm internal pullup resistor.
932S890C
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