ds64ev400sqx National Semiconductor Corporation, ds64ev400sqx Datasheet - Page 8

• Manufacturer Part Number: ds64ev400sqx
• Description: Programmable Quad Equalizer
• Manufacturer: National Semiconductor Corporation

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Serial Management Bus (SMBus)
Configuration Registers
The Serial Management Bus interface is compatible to the
SMBus 2.0 physical layer specification, except for bus termi-
nation voltages. Holding the CS pin high enables the SMBus
Note: RO = Read Only, RW = Read/Write
Name
Status
Status
Status
Enable/
Boost
(BST_1,
BST_0)
Enable/
Boost
(BST_3,
BST_2)
Signal
Detect
ON
(SD_ON)
Signal
Detect
OFF
(SD_OFF
)
SMBus
Control
Output
Level
Address Defaul
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
t
0x00
0x00
0x00
0x44
0x44
0x00
0x00
0x00
0x78
Type
RO
RO
RO
RW
RW
RW
RW
RW
RW
Bit 7
ID Revision
EN1
EN3
EN1
1: Enable
0:
Disable
EN3
1: Enable
0:
Disable
SD3 ON
Threshold Select
00: 70 mV
(Default)
01: 55 mV
10: 90 mV
11: 75 mV
SD3 OFF
Threshold Select
00: 40 mV
(Default)
01: 30 mV
10: 55 mV
11: 45 mV
Reserved
Reserved
TABLE 1. SMBus Register Address
Bit 6
Boost 1
Boost 3
Boost Control
(BC for CH1)
000 (Min Boost)
001
010
011
100 (Default)
101
110
111 (Max Boost)
Boost Control
(BC for CH3)
000 (Min Boost)
001
010
011
100 (Default)
101
110
111 (Max Boost)
Bit 5
SD2 ON Threshold
Select
00: 70 mV (Default)
01: 55 mV
10: 90 mV
11: 75 mV
SD2 OFF Threshold
Select
00: 40 mV (Default)
01: 30 mV
10: 55 mV
11: 45 mV
8
port allowing access to the SMBus registers. The configura-
tion registers can be read and written using SMBus through
the SDA and SDC pins. In the STANDBY state, the Searial
Management Bus remains active. Please see Table 1 for
more information.
Bit 4
Bit 3
SD3
EN0
EN2
EN0
1: Enable
0: Disable
EN2
1: Enable
0: Disable
SD1 ON Threshold
Select
00: 70 mV
(Default) 01: 55 mV
10: 90 mV
11: 75 mV
SD1 OFF Threshold
Select
00: 40 mV (Default)
01: 30 mV
10: 55 mV
11: 45 mV
Output Level:
00: 400 mV
01: 540 mV
10: 620 mV
(Default)
11: 760 mV
P-P
P-P
P-P
p-p
Bit 2
SD2
Boost 0
Boost 2
Boost Control
(BC for CH0)
000 (Min Boost)
001
010
011
100 (Default)
101
110
111 (Max Boost)
Boost Control
(BC for CH2)
000 (Min Boost)
001
010
011
100 (Default)
101
110
111 (Max Boost)
Bit 1
SD1
SD0 ON Threshold
Select
00: 70 mV (Default)
01: 55 mV
10: 90 mV
11: 75 mV
SD0 OFF Threshold
Select
00: 40 mV (Default)
01: 30 mV
10: 55 mV
11: 45 mV
Reserved
Bit 0
SD0
SMBus Enable
0: Disable
1: Enable