Echelon LonWorks Twisted Pair Control Module - Manual (Page 47)

LonWorks Twisted Pair Control Module User's Guide 39
on the control module. The standard TP/XF-78 and TP/FT-10 Control Modules
have a 5 MHz input clock, and require a memory access time of 200 ns or faster.
The TP/XF-1250 Control Module has a 10 MHz input clock, and requires a
memory access time of 90 or 120 ns or faster, depending on the production date of
the module. TP/XF-1250 modules produced before January 1995 (revision code A
to G) require a 90 ns access time or faster. TP/XF-1250 modules produced after
February 1995 (revision code H or higher) require a 120 ns access time or faster.
You can use any 32 Kbyte, PLCC OTP ROMs that fit the socket on the three non-
flash control modules, such as an Atmel AT27C256R-70JI 256K (32K x 8) OTP
EPROM. LCC devices that support UV erasures are not physically compatible
with the PLCC socket. Atmel AT29C256 flash devices work as ROM memory in
the control modules designed to use ROMs. However, none of the PROM-based
control modules support write control of the flash memory. Also, this memory
device is not pin compatible with the AT29C257 used in the flash memory-based
control modules.
The TP/FT-10F and TP/XF-78F Flash Control Modules have a 10 MHz input
clock and require an Atmel AT29C257-90J (32 KB), AT29C517-90J (64 KB total,
56 KB usable, 8 KB unusable), or AT29C010A-90J (128 KB total, 56 KB usable,
72 KB unusable) flash memory. Table 12 lists vendor part numbers for flash
memory devices.
The Neuron Chip firmware must be aware of the flash memory sector size to
properly support write operations. The AT29C257 has a 64-byte sector size,
whereas the AT29C512 and AT29C010A devices have a 128-byte sector size.
Using the large memory devices as an alternate part for the AT29C256 requires
the generation of a new exported image built with a device definition which
contains the correct sector size.
Important: When programming flash memory, the part must be explicitly
secured with Software Data Protection (SDP) enabled by the PROM programmer.
If this feature is not supported by the PROM programmer, the program memory
can become corrupted.
Table 12. Flash Memory Devices for TP/FT-10F and TP/XF-78F Control Modules
Supplier Flash Memory
Atmel Corporation AT29C257-90JC (32K x 8)
AT29C512-90JC (64K x 8, 56 KB usable)
AT29C010A-90JC (128K x 8, 56 KB usable)
Greenliant™ Systems, Inc.
(formerly Silicon Storage Technology)
GLS29EE512-90 (64K x 8, 56 KB usable)
GLS29EE010-90 (128K x 8, 56 KB usable)
In June 2010, Atmel Corporation announced an end of life plan for the following
parts:
• AT29C256
• AT29C257
• AT29C512
• AT29C010A