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| 型号： | FTR-1519-V2 |
| 元件分类： | 光收发 |
| 英文描述： | FIBER OPTIC TRANSCEIVER, REPEATER, 1540-1570nm, 1250Mbps(Tx), 1250Mbps(Rx), PANEL MOUNT |
| 文件页数： | 6/8页 |
| 文件大小： | 158K |
| 代理商： | FTR-1519-V2 |
FTR-1519-V2 Extended GBIC Product Specification – November 2007
F i n i s a r
Finisar Corporation November 16, 2007 Rev. B1
Page 6
VIII. Serial Communication Protocol
All Finisar optical GBICs are ‘Module Definition “4”’ and support the 2 wire serial
communication protocol outlined in the GBIC Specification
1. These GBICs use an
Atmel AT24C01A 128 byte E
2PROM (with an address of 1010000X). For details on
interfacing with the E
2PROM, see the Atmel data sheet titled “AT24C01A/02/04/08/16 2-
Wire Serial CMOS E
2PROM.”5
All Finisar optical GBICs also incorporate a microcontroller that monitors system
parameters such as laser current, laser temperature, and, in the case of 1300nm/1550nm
parts, transmitted power. The microcontroller I
2C address is 1010111X, so it won’t
conflict with the AT24C01A. For a complete description of how to use Finisar’s extended
features, see Finisar’s Application Note AN-2025: “Using the Finisar GBIC I
2C
Test/Diagnostics Port.”
4
CAUTION: The microcontroller implements the Philips I
2C protocol including clock
stretching. For details, consult the Philips I
2C-Bus Specification. Clock stretching
allows a fast master to communicate with a slow slave device, and it requires that the host
monitor the clock line every time it releases the line high. If a host does not implement
clock stretching (drives the bus blind), it must run the clock below 8kHz, so that Finisar’s
microcontroller has time to process instructions. If clock stretching is supported, the
clock may be run at up to 100kHz.
2
I C Timing Requirements
Parameter
Symbol
Min
Typ
Max
Units Notes/Conditions
2
Atmel I C Clock Rate
C
0
100,000
Hz
Bus can be driven blind.
atmel
C
Finisar Microcontroller
I
10
100,000
Hz
Host must support clock stretching.
Microcontroller times out if C <
10Hz.
1
2C Clock Rate
Finisar Microcontroller
I
10
8000
Hz
Bus can be driven blind.
Microcontroller times out if C <
10Hz.
C2
2C Clock Rate
Table 9. I
2C timing requirements
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