l-fw32206t100 ETC-unknow, l-fw32206t100 Datasheet - Page 78

• Manufacturer Part Number: l-fw32206t100
• Description: 1394a Phy/link Open Host Controller
• Manufacturer: ETC-unknow

FW322 06 T100
1394a PCI PHY/Link Open Host Controller
Serial EEPROM Interface
The FW322 features an I
EEPROM. The interface provides a mechanism to store configurable data such as the global unique identification
(GUID) within an external EEPROM.
The interface consists of the ROM_AD and ROM_CLK pins. ROM_CLK is an output clock provided by the FW322
to the external EEPROM. ROM_AD is bidirectional and is used for serial data/control transfers between the FW322
and the external EEPROM.
The FW322 uses this interface to read the contents of the serial EEPROM in response to the first PCI reset after
powerup. The FW322 also makes the serial ROM interface visible to software through the OHCI defined GUID
ROM register. When the FW322 is operational, the GUID ROM register allows software to initiate reads to the
external EEPROM.
The FW322 EEPROM interface has a number of new and updated features that were not present in earlier
revisions of the chip:
1. Improved external interface timing.
2. OHCI soft reset and D3-to-D0 device state transition will not initiate an EEPROM load.
3. Retry of PCI/OHCI/vendor register accesses during an EEPROM load.
4. Load failure and quick EEPROM detection.
5. EEPROM cache.
6. Automatic update of the OHCI 1394 MiniROM field of the GUID_ROM register.
7. Additional EEPROM image formats.
For additional detail, refer to the FW322/FW323 06 EEPROM Interface and Start-Up Behavior Application Note.
ac Characteristics of Serial EEPROM Interface Signals
Table 70. ac Characteristics of Serial EEPROM Interface Signals
78
78
t
t
HOLD_EEPROM
t
t
SETUP_START
t
SETUP_STOP
t
HOLD_START
t
SETUP_DATA
DATA_VALID
t
t
HOLD_DATA
f
t
RISE_TIME
FALL_TIME
t
Symbol
ROM_CLK
PW_HIGH
PW_LOW
t
FREE
Frequency of Serial Clock
Width of Serial Clock Pulse Low
Width of Serial Clock Pulse High
Time from When Serial Clock Transitions Low Until EEPROM
Returns Valid Data
Time I
Started
FW322 Hold Time for a Valid Start Condition
FW322 Setup Time for a Valid Start Condition
Data Out Hold Time for the FW322
Data Out Setup Time for the FW322
Rise Time for Serial Clock and Data Out from the FW322
Fall Time for Serial Clock and Data Out from the FW322
FW322 Setup Time for a Valid Stop Condition
Data Out Hold Time for EEPROM
2
C Bus Must Be Idle Before a New Transaction Can Be
2
C compliant serial ROM interface that allows for the connection of an external serial
Parameter
Min
100
200
4.7
4.0
0.1
4.7
4.0
4.7
4.7
—
—
—
0
Data Sheet, Rev. 1
Max
100
300
4.5
1.0
—
—
—
—
—
—
—
—
—
December 2005
Agere Systems Inc.
Unit
kHz
µs
µs
µs
µs
µs
µs
µs
µs
µs
ns
ns
ns