SNLS466A September   2013  – March 2014 DS125BR401A

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Terminal Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Electrical Characteristics — Serial Management Bus Interface
    7. 6.7 Timing Requirements Serial Bus Interface
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
      1. 7.2.1 Functional Datapath Blocks
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 Terminal Control Mode:
      2. 7.4.2 SMBus Mode:
      3. 7.4.3 MODE operation with SMBus Registers
    5. 7.5 Signal Conditioning Settings
    6. 7.6 Programming
    7. 7.7 Register Maps
      1. 7.7.1 Transfer Of Data Via The SMBus
      2. 7.7.2 SMBus Transactions
      3. 7.7.3 Writing a Register
      4. 7.7.4 Reading a Register
  8. 8 Applications and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Signal Integrity in SAS-3 Applications
      2. 8.1.2 RX-Detect in SAS/SATA Applications
      3. 8.1.3 Signal Integrity in PCIe Applications
      4. 8.1.4 MODE operation with SMBus Registers
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Performance Plots
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

5 Terminal Configuration and Functions

54-Lead WQFN
Top View
terminals.gif
A. Above 54-lead WQFN graphic is a TOP VIEW, looking down through the package.

Terminal Functions(1)

TERMINAL NAME TERMINAL NUMBER I/O, TYPE TERMINAL DESCRIPTION
DIFFERENTIAL HIGH SPEED I/O
INB_0+, INB_0- ,
INB_1+, INB_1-,
INB_2+, INB_2-,
INB_3+, INB_3-		 45, 44, 43, 42
40, 39, 38, 37		 I Inverting and non-inverting CML differential inputs to the equalizer. On-chip 50Ω termination resistor connects INB_n+ to VDD and INB_n- to VDD when enabled.
AC coupling required on high-speed I/O
OUTB_0+, OUTB_0-,
OUTB_1+, OUTB_1-,
OUTB_2+, OUTB_2-,
OUTB_3+, OUTB_3-		 1, 2, 3, 4
5, 6, 7, 8		 O Inverting and non-inverting 50Ω driver outputs with de-emphasis. Compatible with AC coupled CML inputs.
AC coupling required on high-speed I/O
INA_0+, INA_0- ,
INA_1+, INA_1-,
INA_2+, INA_2-,
INA_3+, INA_3-		 10, 11, 12, 13
15, 16, 17, 18		 I Inverting and non-inverting CML differential inputs to the equalizer. On-chip 50Ω termination resistor connects INA_n+ to VDD and INA_n- to VDD when enabled.
AC coupling required on high-speed I/O
OUTA_0+, OUTA_0-,
OUTA_1+, OUTA_1-,
OUTA_2+, OUTA_2-,
OUTA_3+, OUTA_3-		 35, 34, 33, 32
31, 30, 29, 28		 O Inverting and non-inverting 50Ω driver outputs. Compatible with AC coupled CML inputs.
AC coupling required on high-speed I/O
CONTROL TERMINALS — SHARED (LVCMOS)
ENSMB 48 I, LVCMOS System Management Bus (SMBus) enable Terminal
Tie 1kΩ to VDD = Register Access SMBus Slave mode
FLOAT = Read External EEPROM (Master SMBUS Mode)
Tie 1kΩ to GND = Terminal Mode
ENSMB = 1 (SMBus MODE)
SCL 50 I, LVCMOS,
O, OPEN Drain		 ENSMB Master or Slave mode
SMBus clock input Terminal is enabled (slave mode).
Clock output when loading EEPROM configuration (master mode).
SDA 49 I, LVCMOS,
O, OPEN Drain		 ENSMB Master or Slave mode
The SMBus bidirectional SDA Terminal is enabled. Data input or open drain (pull-down only) output.
AD0-AD3 54, 53, 47, 46 I, LVCMOS ENSMB Master or Slave mode
SMBus Slave Address Inputs. In SMBus mode, these Terminals are the user set SMBus slave address inputs.
READ_EN 26 I, LVCMOS When using an External EEPROM, a logic low on this terminal starts the load from the external EEPROM
ENSMB = 0 (TERMINAL MODE)
EQA0, EQA1
EQB0, EQB1		 20, 19
46, 47		 I, 4-LEVEL,
LVCMOS 		EQA[1:0] and EQB[1:0] control the level of equalization of the A/B directions. The Terminals are defined as EQx[1:0] only when ENSMB is de-asserted (low). Each of the 4 A/B channels have the same level unless controlled by the SMBus control registers. When ENSMB goes high the SMBus registers provide independent control of each lane. The EQB[1:0] Terminals are converted to SMBus AD2, AD3 inputs. See Table 5.
DEMB0, DEMB1 53, 54 I, 4-LEVEL,
LVCMOS		 DEMB[1:0] controls the level of de-emphasis of CHB outputs. The Terminals are defined as DEMB[1:0] only when ENSMB is de-asserted (low). Each of the 4 B channels have the same level unless controlled by the SMBus control registers. When ENSMB goes high the SMBus registers provide independent control of each lane. The DEMB[1:0] Terminals are converted to AD0, AD1 inputs. See Table 7.
MODE_B 21 I, 4-LEVEL,
LVCMOS 		MODE_B control Terminal selects operating modes for the INB-OUTB Channels.
Tie 1kΩ to GND = GEN 1,2 and SAS 1,2
Float = Auto Mode Select (for PCIe)
Tie 20kΩ to GND = SAS-3 and GEN-3 without De-emphasis
Tie 1kΩ to VDD = SAS-3 and GEN-3 with De-emphasis
See Table 4.
DEMA0, DEMA1 49, 50 I, 4-LEVEL,
LVCMOS 		DEMA[1:0] controls the CHA output amplitude. The Terminals are defined as DEMA[1:0] only when ENSMB is de-asserted (low). Each of the 4 A channels have the same level unless controlled by the SMBus control registers. When ENSMB goes high the SMBus registers provide independent control of each lane and the DEMA[1:0] Terminals are converted to SCL and SDA. See Table 7.
SD_TH 26 I, 4-LEVEL,
LVCMOS 		Controls the internal Signal Detect Threshold on the INB-OUTB Channels. For CHB, the signal detect is used to bring the output into and out of IDLE. This allows the OOB signaling to pass with minimal distortion.
See Table 3.
CONTROL TERMINALS — BOTH TERMINAL AND SMBus MODES (LVCMOS)
RXDET 22 I, 4-LEVEL,
LVCMOS 		The RXDET Terminal controls the receiver detect function. Depending on the input level, a 50Ω or >50KΩ termination to the power rail is enabled. In SAS/SATA system RXDET should be set to a Logic "1" state to keep the termination always enabled.
See Table 2.
RES 23 I, 4-LEVEL,
LVCMOS 		Reserved:
This input must be left Floating.
VDD_SEL 25 I, FLOAT Controls the internal regulator
Float = 2.5V mode
Tie GND = 3.3V mode
PWDN 52 I, LVCMOS Tie High = Low power - power down
Tie GND = Normal Operation
See Table 2.
ALL_DONE 27 O, LVCMOS Valid Register Load Status Output
HIGH = External EEPROM load failed or incomplete
LOW = External EEPROM load passed
POWER
VIN 24 Power In 3.3V mode, feed 3.3V to VIN
In 2.5V mode, leave floating.
VDD 9, 14,36, 41, 51 Power Power supply Terminals CML/analog
2.5V mode, connect to 2.5V
3.3V mode, connect 0.1 µF cap to each VDD Terminal and GND
GND DAP Power Ground pad (DAP - die attach pad).
(1) LVCMOS inputs without the “Float” conditions must be driven to a logic low or high at all times or operation is not ensured.
Input edge rate for LVCMOS/FLOAT inputs must be faster than 50 ns from 10–90%.
For 3.3V mode operation, VIN Terminal input = 3.3V and the logic "1" reference for the 4-level input is 3.3V.
For 2.5V mode operation, VDD Terminal output= 2.5V and the logic "1" reference for the 4-level input is 2.5V.