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ADM1166
UPDATING THE SEQUENCING ENGINE
Sequencing engine (SE) functions are not updated in the same
way as regular configuration latches. The SE has its own dedicated
512-byte nonvolatile, electrically erasable, programmable, read-
only memory (EEPROM) for storing state definitions, providing
63 individual states each with a 64-bit word (one state is reserved).
At power-up, the first state is loaded from the SE EEPROM into
the engine itself. When the conditions of this state are met, the
Page 8 to Page 11 are available for customer use to store any
information that may be required by the customer in their
application. Customers can store information on Page 12 to
Page 15, or these pages can store the fault records written by the
sequencing engine if users have decided to enable writing of the
fault records for different states.
Data can be downloaded from the EEPROM to the RAM in one
of the following ways:
next state is loaded from the EEPROM into the engine, and so
on. The loading of each new state takes approximately 10 μs.
?
?
At power-up, when Page 0 to Page 4 are downloaded.
By setting Bit 0 of the UDOWNLD register (0xD8), which
To alter a state, the required changes must be made directly to
the EEPROM. RAM for each state does not exist. The relevant
alterations must be made to the 64-bit word, which is then
uploaded directly to the EEPROM.
INTERNAL REGISTERS
The ADM1166 contains a large number of data registers. The
principal registers are the address pointer register and the
configuration registers.
Address Pointer Register
The address pointer register contains the address that selects
one of the other internal registers. When writing to the ADM1166,
the first byte of data is always a register address that is written to
the address pointer register.
Configuration Registers
The configuration registers provide control and configuration
for various operating parameters of the ADM1166.
EEPROM
The ADM1166 has two 512-byte cells of nonvolatile EEPROM
from Address 0xF800 to Address 0xFBFF. The EEPROM is used
for permanent storage of data that is not lost when the ADM1166 is
powered down. One EEPROM cell, 0xF800 to 0xF9FF, contains the
configuration data, user information and, if enabled, any fault
records of the device; the other section, 0xFA00 to 0xFBFF, contains
the state definitions for the SE. Although referred to as read-only
memory, the EEPROM can be written to, as well as read from,
using the serial bus in exactly the same way as the other registers.
The major differences between the EEPROM and other
registers are as follows:
? An EEPROM location must be blank before it can be
written to. If it contains data, the data must first be erased.
? Writing to the EEPROM is slower than writing to the RAM.
? Writing to the EEPROM should be restricted because it has
a limited write/cycle life of typically 10,000 write operations
due to the usual EEPROM wear-out mechanisms.
performs a user download of Page 0 to Page 4.
When the sequence engine is enabled, it is not possible to access
the section of EEPROM from Address 0xFA00 to Address 0xFBFF.
The sequence engine must be halted before it is possible to read
or write to this range. Attempting to read or write to this range if
the sequence engine is not halted will generate a no acknowledge,
or NACK.
Read/write access to the configuration and user EEPROM ranges
from Address 0xF800 to Address 0xF89F and Address 0xF900
to Address 0xF9FF depends on whether the black box fault
recorder is enabled. If the fault recorder is enabled and one or
more states have been set as fault record trigger states, then it is
not possible to access any EEPROM location in this range
without first halting the black box. Attempts to read or write
this EEPROM range while the fault recorder is operating are
acknowledged by the device but do not return any useful data
or modify the EEPROM in any way.
If none of the states are set as fault record trigger states, then the
black box is considered disabled, and read/write access is allowed
without having to halt the black box fault recorder.
SERIAL BUS INTERFACE
The ADM1166 is controlled via the serial system management
bus (SMBus) and is connected to this bus as a slave device under
the control of a master device. It takes approximately 1 ms after
power-up for the ADM1166 to download from its EEPROM.
Therefore, access to the ADM1166 is restricted until the
download is complete.
Identifying the ADM1166 on the SMBus
The ADM1166 has a 7-bit serial bus slave address (see Table 11).
The device is powered up with a default serial bus address. The
five MSBs of the address are set to 01101; the two LSBs are
determined by the logical states of Pin A1 and Pin A0. This
allows the connection of four ADM1166s to one SMBus.
Table 11. Serial Bus Slave Address
The first EEPROM is split into 16 (0 to 15) pages of 32 bytes each.
Page 0 to Page 3, from Address 0xF800 to Address 0xF89F, hold
the configuration data for the applications on the ADM1166
(such as the SFDs and PDOs). These EEPROM addresses are
the same as the RAM register addresses, prefixed by F8. Page 5
A1 Pin
Low
Low
High
High
A0 Pin
Low
High
Low
High
Hex Address
0x68
0x6A
0x6C
0x6E
7-Bit Address 1
0110100x
0110101x
0110110x
0110111x
to Page 7, from Address 0xF8A0 to Address 0xF8FF, are reserved.
1
x = Read/write bit. The address is shown only as the first 7 MSBs.
Rev. 0 | Page 26 of 32
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