Electronic Components Datasheet Search |
|
M29DW128F Datasheet(PDF) 86 Page - Numonyx B.V |
|
M29DW128F Datasheet(HTML) 86 Page - Numonyx B.V |
86 / 94 page High Voltage Block Protection M29DW128F 86/94 D.2 In-System technique The In-System technique requires a high voltage level on the Reset/Blocks Temporary Unprotect pin, RP (1). This can be achieved without violating the maximum ratings of the components on the microprocessor bus, therefore this technique is suitable for use after the memory has been fitted to the system. To protect a group of blocks follow the flowchart in Figure 25: In-System equipment Group Protect flowchart. To unprotect the whole chip it is necessary to protect all of the groups first, then all the groups can be unprotected at the same time. To unprotect the chip follow Figure 26: In-System equipment Chip Unprotect flowchart. The timing on these flowcharts is critical. Care should be taken to ensure that, where a pause is specified, it is followed as closely as possible. Do not allow the microprocessor to service interrupts that will upset the timing and do not abort the procedure before reaching the end. Chip Unprotect can take several seconds and a user message should be provided to show that the operation is progressing. Note: RP can be either at VIH or at VID when using the In-System Technique to protect the Extended Block. Table 42. Programmer technique Bus operations, 8-bit or 16-bit mode Operation E G W Address Inputs A0-A22 Data Inputs/Outputs DQ15A–1, DQ14-DQ0 Block (Group) Protect(1) VIL VID VIL Pulse A9 = VID, A12-A22 Block Address Others = X X Chip Unprotect VID VID VIL Pulse A6 = VIH, A9 = VID, A12 = VIH, A15 = VIH Others = X X Block (Group) Protect Verify VIL VIL VIH A0 = VIL, A1 = VIH, A2-A7 = VIL, A9 = VID, A12-A22 Block Address Others = X Pass = xx01h Retry = xx00h. Block (Group) Unprotect Verify VIL VIL VIH A0 = VIL, A1 = VIH, A2 -A5 = VIL, A6 = VIH, A7 = VIL, A9 = VID, A12-A22 Block Address Others = X Pass = xx00h Retry = xx01h. 1. Block Protection Groups are shown in Appendix A, Table 34. |
Similar Part No. - M29DW128F |
|
Similar Description - M29DW128F |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |