Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsDS34S102GN+

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____________________________________________________ DS34S101, DS34S102, DS34S104, DS34S108

Rev: 032609 184 of 198

16.

PIN ASSIGNMENTS

16.1

Board Design for Multiple DS34S101/2/4 Devices

The DS34S101, DS34S102 and DS34S104 require the same footprint on the board. It is recommended that

boards be design to support the use of higher port-count devices in a lower port-count socket. If this is done,

unused inputs, input/outputs, and outputs must be biased appropriately. Generally, unused inputs are tied directly

to the ground plane, unused outputs are not connected, and unused input/outputs are tied to ground through a

10kΩ resistor. Unused inputs with internal pull-ups or pull-downs are not connected. Table 16-1 designates how

each ball on the package should be connected to implement a common board design. Shading indicates balls for

the unused inputs, input/outputs, and outputs of higher port-count devices.

If a common board design is not done, the balls for the unused inputs, input/outputs, and outputs need not be

connected, and the stuffing of higher port-count devices into a lower port-count socket is not recommended.

Note: When a higher port-count device is used in a socket, the BSDL file of the higher port-count device must be

used. BSDL files are available from the factory upon request.

Table 16-1. Common Board Design Connections for DS34S101/2/4 (Sorted by Signal Name)

Ball

DS34S104 Socket

DS34S102 Socket

DS34S101 Socket

ACVDD1

ACVDD2

ACVSS1

ACVSS2

M14

CLK_CMN

CLK_HIGH

A16

CLK_MII_RX

D15

CLK_MII_TX

E15

CLK_SSMII_TX

T12

CLK_SYS

CLK_SYS/SCCLK

CLK_SYS_S

DAT_32_16_N

F10

DVDDC

F11

DVDDC

M10

DVDDC

M11

DVDDC

G12

DVDDIO

H12

DVDDIO

J12

DVDDIO

K12

DVDDIO