Datasheet
©2011 Silicon Storage Technology, Inc. DS25029A 06/11
15
16 Mbit LPC Serial Flash
SST49LF016C
Data Sheet
A
Microchip Technology Company
Non-boundary-aligned address:
The SST49LF016C accepts multi-byte transfers for both Read and Write operations. The device
address space is divided into uniform page sizes 2, 4, 16, or 128 bytes wide, according to the MSIZE
value (see Table 6). The host issues only one address in the MADDR field of the Firmware Memory
Cycle, but multiple bytes are read from or written to the device. For this reason the MADDR address
should be page boundary-aligned. This means the address should be aligned to a Word boundary (A
0
= 0) for a 2-byte transfer, a double Word boundary (e.g. A
0
=0,A
1
= 0) for a 4-byte transfer, and so on.
If the address supplied by the host is not page boundary-aligned, the SST49LF016C will force a
boundary alignment, starting the multi-byte Read or Write operation from the lower byte of the
addressed page.
Multiple Device Selection
Multiple LPC serial flash devices may be strapped to increase memory densities in a system. The four
ID pins, ID[3:0], allow up to 16 devices to be attached to the same bus by using different ID strapping in
a system. BIOS support, bus loading, or the attaching bridge may limit this number. The boot device
must have an ID of 0000b (determined by ID[3:0]); subsequent devices use incremental numbering.
Equal density must be used with multiple devices.
Multiple Device Selection for Firmware Memory Cycle
For Firmware Memory Read/Write cycles, hardware strapping values on ID[3:0] must match the values
in IDSEL field. The SST49LF016C will compare these bits with ID[3:0]’s strapping values. If there is a
mismatch, the device will ignore the remainder of the cycle. See Table 7 for Multiple Device Selection
Configuration.
Table 7: Firmware Memory Multiple Device Selection Configuration
Device # ID[3:0] IDSEL
0 (Boot device) 0000 0000
1 0001 0001
2 0010 0010
3 0011 0011
4 0100 0100
5 0101 0101
6 0110 0110
7 0111 0111
8 1000 1000
9 1001 1001
10 1010 1010
11 1011 1011
12 1100 1100
13 1101 1101
14 1110 1110
15 1111 1111
T7.0 25029