VSC7440 datasheet(392/444 Pages) MICROSEMI

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Electrical Specifications

VMDS-10492 VSC7440 Datasheet Revision 4.2

375

The following table lists the 10G receiver specifications. Applies to the S[10:7]_RXN/P pins. Note that

only S[10:9]_RXN/P pins support 10GBASE-KR and SFP+ (SFI).

6.1.7

GPIO, SI, JTAG, and Miscellaneous Signals

This section provides the DC specifications for the GPIO, SI, JTAG, and miscellaneous signals.

The following I/O signals comply with the specifications provided in this section:

The outputs and inputs meet or exceed the requirements of the LVTTL and LVCMOS standard, JEDEC

JESD8-B (September 1999) standard, unless otherwise stated. The inputs are Schmitt-trigger for noise

immunity.

Differential peak-to-peak output

voltage1

VO_DIFF

300

800

mVppd 100BASE-FX, SGMII

Differential peak-to-peak output

voltage1

VO_DIFF

500

1200

mVppd SFP2, 2.5G

Differential peak-to-peak output

voltage1

VO_DIFF

8002

1200

mVppd 10GBASE-KR3

Differential peak-to-peak output

voltage with Tx disabled

VOD_IDLE

mVppd

Differential output swing is register configurable.

The minimum drive level is the lowest guaranteed drive level achievable with the maximum amplitude configuration applied.

Compatibility to supported standard requires VDD_HS = 1.2 V supply for output driver.

Table 284 •

10G Receiver

Parameter

Symbol Minimum

Typical Maximum

Unit

Condition

Differential resistance

RDIFF

100

120

Differential peak-to-peak

input voltage

VI_DIFF

100

1200

mVppd Clean eye sensitivity

AC-coupling1

AC-coupling should be done at receiver.

100

Table 285 •

I/O Signals

GPIO[36:0]

JTAG_nTRST

nRESET

SI_CLK

JTAG_TMS

SI_DI

JTAG_TDO

SI_DO

JTAG_TCK

SI_nCS0

JTAG_TDI

JTAG_ICE_nEN

Table 286 •

GPIO, SI, JTAG, and Miscellaneous Signals DC Specifications

Parameter

Symbol Minimum

Typical

Maximum

Unit

Condition

Output high voltage1

VOH

2.1

2.35

IOH = –2 mA

Output high voltage1

VOH

1.7

2.0

IOH = –12 mA

Table 283 •

10G Transmitter (continued)

Parameter

Symbol

Minimum

Typical Maximum Unit

Condition

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