JS48F4400PCZ00 データシートの表示（PDF） - Numonyx -> Micron
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JS48F4400PCZ00 Datasheet PDF : 102 Pages
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Numonyx™ Wireless Flash Memory (W18)
Figure 34: Protection Register Locking
0x88
User-Programmable
0x85
0x84
Intel Factory-Programmed
0x81
PR Lock Register 0
0x80 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
13.3
VPP Protection
The Numonyx™ Wireless Flash Memory (W18) provides in-system program and erase
at VPP1. For factory programming, it also includes a low-cost, backward-compatible
12 V programming feature.(Section 11.2, “Factory Programming” on page 60) The EFP
feature can also be used to greatly improve factory program performance as explained
in Section 11.3, “Enhanced Factory Program (EFP)” on page 61.
In addition to the flexible block locking, holding the VPP programming voltage low can
provide absolute hardware write protection of all flash-device blocks. If VPP is below
VPPLK, program or erase operations result in an error displayed in SR[3]. (See
Figure 35.)
Figure 35: Examples of VPP Power Supply Configurations
System supply
12 V supply
≤ 10K Ω
VCC
VPP
• 12 V fast programming
• Absolute write protection with VPP ≤ VPPLK
System supply
(Note 1)
12 V supply
VCC
VPP
System supply
VCC
Prot# (logic signal)
VPP
• Low-voltage programming
• Absolute write protection via logic signal
System supply
VCC
VPP
• Low voltage and 12 V fast programming
• Low-voltage programming
Note: If the VCC supply can sink adequate current, you can use an appropriately valued resistor.
November 2007
Order Number: 290701-18
Datasheet
77
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