SST49LF040-33-4C-WH SST [Silicon Storage Technology, Inc], SST49LF040-33-4C-WH Datasheet - Page 12

• Manufacturer Part Number: SST49LF040-33-4C-WH
• Description: 4 Mbit LPC Flash
• Manufacturer: SST [Silicon Storage Technology, Inc]

©2001 Silicon Storage Technology, Inc.
FIGURE 5: B
Boot Device #0
(Boot Block)
(Boot Block)
(Boot Block)
(Boot Block)
(Boot Block)
(Boot Block)
Device #14
Device #15
Device #14
Device #15
B
M
Device #2
Device #3
Device #0
Device #1
Device #2
Device #3
Device #1
OOT
OTTOM OF THE
EMORY
562 ILL F02.3
C
ONFIGURATION FROM THE
M
AP
Register Access
Memory Access
00FF FFFFH
0080 0000H
007F FFFFH
0000 0000H
4 GB
8 MByte
8 MByte
YTE
S
YSTEM
12
Registers
There are two registers available on the SST49LF040, the
General Purpose Inputs Registers (GPI_REG) and the
JEDEC ID Registers. Since multiple LPC memory devices
may be used to increase memory densities, these registers
appear at its respective address location in the 4 GByte
system memory map. Unused register locations will read
as 00H. Any attempt to read registers during internal Write
operation will respond as “Write Operation Status Detec-
tion” (Data# Polling or Toggle Bit). Tables 4 and 5 list
GPI_REG and JEDEC ID address locations for
SST49LF040 with its respective device strapping.
TABLE 3: G
General Purpose Inputs Register
The GPI_REG (General Purpose Inputs Register) passes
the state of GPI[4:0] pins at power-up on the SST49LF040.
It is recommended that the GPI[4:0] pins be in the desired
state before LFRAME# is brought low for the beginning of
the next bus cycle, and remain in that state until the end of
the cycle. There is no default value since this is a pass-
through register. See Table 3, General Purpose Inputs
Register, for the GPI_REG bits and functions and Tables 4
and 5 for memory address location for its respective device
strapping.
Bit
7:5
4
3
2
1
0
Function
Reserved
GPI[4]
Reads status of general
purpose input pin
GPI[3]
Reads status of general
purpose input pin
GPI[2]
Reads status of general
purpose input pin
GPI[1]
Reads status of general
purpose input pin
GPI[0]
Reads status of general
purpose input pin
ENERAL
P
URPOSE
4 Mbit LPC Flash
I
32-PLCC
NPUTS
Advance Information
30
3
4
5
6
-
SST49LF040
S71213-00-000 11/01 562
R
Pin #
EGISTER
32-TSOP
11
12
13
14
6
-
T3.1 562