LAN9514 datasheet(27/54 Pages) MICROCHIP

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DS00002306A-page 27

LAN9514/LAN9514I

Note 3-1

Default value is dependent on device revision.

38h

Port Remap 5 Register (PRTR5)

When a hub is enumerated by a USB Host Controller, the hub is only permitted to

report how many ports it has. The hub is not permitted to select a numerical range

or assignment. The Host Controller will number the downstream ports of the hub

starting with the number 1, up to the number of ports that the hub reported having.

The host’s port number is referred to as “Logical Port Number” and the physical port

on the hub is the “Physical Port Number”. When remapping mode is enabled (see

Port Re-Mapping Enable (PRTMAP_EN) bit in Config Data Byte 3 Register (CFG3)

Format) the hub’s downstream port numbers can be remapped to different logical

port numbers (assigned by the host).

Note:

The OEM must ensure that Contiguous Logical Port Numbers are used,

starting from #1 up to the maximum number of enabled ports, this ensures

that the hub’s ports are numbered in accordance with the way a Host will

communicate with the ports.

05h

39h

Status/Command Register (STCD)

Refer to Table 3-10, “Status/Command Register (STCD) Format,” on page 31 for

details.

01h

TABLE 3-3:

HUB CONFIGURATION (CONTINUED)

EEPROM

Offset

Description

Default

Bit [7:4] =

RESERVED

Bit [3:0] =

0000

Physical Port 5 is Disabled

0001

Physical Port 5 is mapped to Logical Port 1

0010

Physical Port 5 is mapped to Logical Port 2

0011

Physical Port 5 is mapped to Logical Port 3

0100

Physical Port 5 is mapped to Logical Port 4

0101

Physical Port 5 is mapped to Logical Port 5

All others RESERVED

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