AT49LH00B4-33JC SL383 Atmel, AT49LH00B4-33JC SL383 Datasheet - Page 15

• Manufacturer Part Number: AT49LH00B4-33JC SL383
• Description: IC FLASH 4MBIT 33MHZ 32PLCC
• Manufacturer: Atmel

Specifications of AT49LH00B4-33JC SL383

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 4M (512K x 8)
• Speed: 33MHz
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

7.7
Figure 7-5.
3379C–FLASH–3/05
FWH4/LFRAME
FWH/LAD[3:0]
LPC Read Cycle
CLK
LPC Read Cycle
0000b
START
1
CYCTYPE
010xb
+ DIR
2
LPC read cycles are used to read data from the memory array, the Sector Locking Registers, the
GPI register, the Status Register, and the product ID information. Upon initial device power-up or
after exiting from a reset condition, the device will automatically default to the read array mode.
Valid LPC read cycles begin with a START field of 0000b and a CYCTYPE + DIR field of 010xb
being sent to the device. Following the MADDR field, a 2-clock TAR field must be sent to the
device to indicate that the master is turning control of the LPC bus over to the LPC memory
device. After the second clock of the TAR phase, the LPC device assumes control of the bus
and begins driving SYNC fields to add wait-states. When the device is ready to output data, it
will first send a “ready” SYNC and then output one byte of data during the next two clock cycles.
The data is sent one nibble at a time with the low nibble being output first followed by the high
nibble. After the data has been output, the LPC device will send a 2-clock TAR field to the mas-
ter to indicate that it is turning control of the LPC bus back over to the master.
Figure 7-4
memory array.
A31-A28
3
A27-A24
4
shows a LPC read cycle that requires three SYNC clocks to access data from the
A23-A20 A19-A16
5
MADDR
6
A15-A12
7
A11-A8
8
A7-A4
9
A3-A0
10
1111b
TAR0
11
High-Z
TAR1
12
WSYNC
0101b
13
WSYNC
0101b
14
RSYNC
0000b
15
AT49LH00B4
D3-D0
DATA
16
D7-D4
DATA
17
1111b
TAR0
18
High-Z
TAR1
19
15