JS28F128P33TF70A datasheet(40/88 Pages) MICROCHIP

40 / 88 page

P33-65nm

Datasheet

Jul 2011

Order Number: 208034-04

11.1.9

Clock Edge (RCR.6)

The Clock Edge (CE) bit selects either a rising (default) or falling clock edge for CLK.

This clock edge is used at the start of a burst cycle, to output synchronous data, and to

assert/deassert WAIT.

11.1.10

Burst Wrap (RCR.3)

The Burst Wrap (BW) bit determines whether 4, 8, or 16-word burst length accesses

wrap within the selected word-length boundaries or cross word-length boundaries.

When BW is set, burst wrapping does not occur (default). When BW is cleared, burst

wrapping occurs.

11.1.11

Burst Length (RCR[2:0])

The Burst Length bits (BL[2:0]) selects the linear burst length for all synchronous burst

reads of the flash memory array. The burst lengths are 4-word, 8-word, 16-word, and

continuous word.

Continuous burst accesses are linear only, and do not wrap within any word length

boundaries (see Table 16, “Burst Sequence Word Ordering” on page 39). When a burst

cycle begins, the device outputs synchronous burst data until it reaches the end of the

“burstable” address space.

11.2

One-Time Programmable (OTP) Registers

The device contains 17 OTP Registers that can be used to implement system security

measures and/or device identification. Each OTP Register can be individually locked.

The first 128-bit OTP Register is comprised of two 64-bit (8-word) segments. The lower

64-bit segment is pre-programmed at the Numonyx factory with a unique 64-bit

number. The other 64-bit segment, as well as the other sixteen 128-bit OTP Registers,

are blank. Users can program these registers as needed. Once programmed, users can

then lock the OTP Register(s) to prevent additional bit programming (see Figure 12,

“OTP Register Map” on page 41).

The OTP Registers contain OTP bits; when programmed, PR bits cannot be erased. Each

OTP Register can be accessed multiple times to program individual bits, as long as the

Each OTP Register has an associated Lock Register bit. When a Lock Register bit is

programmed, the associated OTP Register can only be read; it can no longer be

programmed. Additionally, because the Lock Register bits themselves are OTP, when

programmed, Lock Register bits cannot be erased. Therefore, when a OTP Register is

locked, it cannot be unlocked.

JS28F128P33TF70A Datasheet(PDF) 40 Page - Microchip Technology