RC28F128M29EWLA NUMONYX, RC28F128M29EWLA Datasheet - Page 38

• Manufacturer Part Number: RC28F128M29EWLA
• Description: IC FLASH 128MBIT 25NS 64BGA
• Manufacturer: NUMONYX
• Series: Axcell™r

Specifications of RC28F128M29EWLA

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 128M (16Mx8, 8Mx16)
• Speed: 60ns
• Interface: Parallel
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Command Interface
6.2.4
Note:
38
Write to Buffer Program command
The Write to Buffer Program command makes use of the device’s 256-word program buffer
to speed up programming. A maximum of 256 words can be loaded into the program buffer
in word mode. In byte mode, the maximum buffer size is 256-byte (128-word) due to the
limitation of 8 pins. The Write to Buffer Program command dramatically reduces system
programming time compared to the standard non-buffered Program command.
The maximum number of bytes in write buffer in CFI region (refer to offset 2Ah,
Device geometry definition on page
reasons. No software change is required on the existing applications in both x8 and x16
mode. However, the system performance can be optimized by implement the maximum
256-word buffer size, contact your sales representatives for questions.
When issuing a Write to Buffer Program command, the V
High, V
See
Five successive steps are required to issue the Write to Buffer Program command:
1.
2.
3.
4.
5.
To program the content of the program buffer, this command must be followed by a Write to
Buffer Program Confirm command.
If an address is written several times during a Write to Buffer Program operation, the
address/data counter will be decremented at each data load operation and the data will be
programmed to the last word loaded into the buffer.
Invalid address combinations or failing to follow the correct sequence of Bus Write cycles
will abort the Write to Buffer Program.
The Status Register bits DQ1, DQ5, DQ6, DQ7 can be used to monitor the device status
during a Write to Buffer Program operation.
It is possible to detect Program operation fails when changing programmed data from ‘0’ to
‘1’, that is when reprogramming data in a portion of memory already programmed. The
resulting data will be the logical OR between the previous value and the current value.
See
on using the Write to Buffer Program command.
Figure 11: Write to Buffer Program fletcher and pseudo
Table 28
The Write to Buffer Program command starts with two unlock cycles.
The third bus write cycle sets up the Write to Buffer Program command. The set-up
code can be addressed to any location within the targeted block.
The fourth bus write cycle sets up the number of words/bytes to be programmed. Value
N is written to the same block address, where N+1 is the number of words/bytes to be
programmed. N+1 must not exceed the size of the program buffer, otherwise the
operation will abort. In x8 mode, the maximum N should be no more than 256.
The fifth cycle loads the first address and data to be programmed.
Use N bus write cycles to load the address and data for each word/byte into the
program buffer. Addresses must lie within the range from the start address+1 to the
start address + N-1. Optimum programming performance and lower power usage are
obtained by aligning the starting address at the beginning of a 256-word boundary
(A[7:0] = 000h). All the addresses used in the Write to Buffer Program operation must
lie within the 256-word boundary. Any crossing boundary buffer program will result in a
program abort. See
IH
, or raised to V
for details on typical Write to Buffer Program times in both cases.
PPH
Figure 10
(programming acceleration).
for details of the available program buffer size.
208031-04
92) is set to 08h (256 bytes) for backward compatible
PP
/WP# pin can be either held
code, for a suggested flow chart
Numonyx
®
Axcell™ M29EW
Table 39: