USB2513 datasheet(42/63 Pages) MICROCHIP

42 / 63 page

USB 2.0 Hi-Speed Hub Controller

Datasheet

Revision 2.2 (02-17-12)

SMSC USB251xB/xBi

DATASHEET

5.2.3

Pull-Up Resistor

The circuit board designer is required to place external pull-up resistors (10 k

Ω recommended) on the

SDA/SMBDATA and SCL/SMBCLK/CFG_SEL[0] lines (per SMBus 1.0 Specification [3], and EEPROM

manufacturer guidelines) to VDD33 in order to assure proper operation.

5.2.4

In-Circuit EEPROM Programming

The EEPROM can be programmed via automatic test equipment (ATE) by pulling RESET_N low (which

tri-states the hub’s EEPROM interface and allows an external source to program the EEPROM).

5.3

SMBus

The SMSC hub can be configured by an external processor via an SMBus interface (see Table 5.1 for

details on enabling the SMBus interface). The SMBus interface shares the same pins as the EEPROM

interface, and therefore the hub no longer supports the I2C EEPROM interface when the SMBus

interface has been enabled. The SMSC hub waits indefinitely for the SMBus code load to complete

and only appears as a newly connected device on USB after the code load is complete.

The hub’s SMBus acts as a slave-only SMBus device. The implementation only supports block write

(Section 5.3.2.1) and block read (Section 5.3.2.2) protocols, where the available registers are outlined

in Section 5.1 on page 27. Reference the System Management Bus Specification [3] for additional

information.

5.3.1

SMBus Slave Address

The 7-bit slave address is 0101100b. The hub will not respond to the general call address of 0000000b.

5.3.2

Protocol Implementation

Typical block write and block read protocols are shown in figures 5.1 and 5.2. Register accesses are

performed using 7-bit slave addressing, an 8-bit register address field, and an 8-bit data field. The

shading shown in the figures during a read or write indicates the hub is driving data on the SMBDATA

line; otherwise, host data is on the SDA/SMBDATA line.

The SMBus slave address assigned to the hub (0101100b) allows it to be identified on the SMBus.

The register address field is the internal address of the register to be accessed. The register data field

is the data that the host is attempting to write to the register or the contents of the register that the

host is attempting to read.

Note:

Data bytes are transferred MSB first.

USB2513 数据表(PDF) 42 Page - Microchip Technology

USB2513 数据表(HTML) 42 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63

数据表下载