參數(shù)資料
型號(hào)： DS100BR111SQE/NOPB
廠商： National Semiconductor
文件頁(yè)數(shù)： 10/43頁(yè)
文件大小： 0K
描述： IC REPEATER 10.3GBPS 2CH 24LLP
標(biāo)準(zhǔn)包裝： 250
系列： *
SNLS338E – JANUARY 2011 – REVISED FEBRUARY 2013
EEPROM Modes in DS100BR111 Devices
The DS100BR111 supports reading directly from an external EEPROM device by implementing SMBus Master
mode. When using the SMBus master mode, the DS100 will read directly from specific location in the external
EEPROM. When designing a system for using the external EEPROM, the user needs to follow these specific
guidelines.
Set the DS100BR111 into SMBus Master Mode
–
Float ENSMB (PIN 3)
The external EEPROM device must support 400 KHz operation
The external EEPROM device address byte must be 0xA0'h
Set the AD[3:0] inputs for SMBus address byte. When the AD[3:0] = 0000'b, the device address byte is B0'h.
Based on the SMBus 2.0 specification, a device can have a 7-bit slave address of 1010 000'b. The LSB is set
to 0'b (for a WRITE). The bit mapping for SMBus is listed below:
–
[7:5] = Reserved Bits from the SMBus specification
–
[4:1] = Usable SMBus Address Bits
–
[0] = Write Bit
The DS100BR111 devices have AD[3:0] inputs in SMBus mode (pins 1, 2, 9, 10). These pins set SMBus
slave address. When the AD[3:0] = 0001'b, the device address byte is B2'h.
–
[7:5] = Default to 3b'101
–
[4:1] = Address of 4'b0001
–
[0] = Write Bit, 1'b0
The device address can be set with the use of the AD[3:0] input up to 16 different addresses. Use the
example below to set each of the SMBus addresses.
–
AD[3:0] = 0001'b, the device address byte is B2'h
–
AD[3:0] = 0010'b, the device address byte is B4'h
–
AD[3:0] = 0011'b, the device address byte is B6'h
–
AD[3:0] = 0100'b, the device address byte is B8'h
The master implementation in the DS100BR111 supports multiple devices reading from 1 EEPROM. When
tying multiple devices to the SDA and SCL pins, use these guidelines:
–
Use adjacent SMBus addresses for the 4 devices
–
Use a pull-up resistor on SDA; value = 4.7K
–
Use a pull-up resistor on SCL: value = 4.7K
–
Daisy-chain READEN# (pin 17) and DONE# (pin18) from one device to the next device in the sequence
1. Tie READEN# of the 1st device in the chain (U1) to GND
2. Tie DONE# of U1 to READEN# of U2
3. Tie DONE# of U2 to READEN# of U3
4. Tie DONE# of U3 to READEN# of U4
5. Optional: Tie DONE# of U4 to a LED to show each of the devices have been loaded successfully
Master EEPROM Mode in the DS100BR111
Below is an example of a 2 kbits (256 x 8-bit) EEPROM in hex format for the DS100BR111 device. The first 3
bytes of the EEPROM always contain a header common and necessary to control initialization of all devices
connected to the I2C bus. CRC enable flag to enable/disable CRC checking. There is a MAP bit to flag the
presence of an address map that specifies the configuration data start in the EEPROM. If the MAP bit is not
present the configuration data start address is derived from the DS100BR111 address and the configuration data
size. A bit to indicate an EEPROM size > 256 bytes is necessary to properly address the EEPROM. There are 37
bytes of data size for each DS100BR111 device.
18
Copyright 2011–2013, Texas Instruments Incorporated
Product Folder Links: DS100BR111
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