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參數(shù)資料
| 型號(hào)： | DS2432P |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類(lèi)： | Programmable ROM |
| 英文描述： | 1K X 1 1-WIRE SERIAL EEPROM, PDSO6 |
| 封裝： | 0.150 INCH, TSOC-6 |
| 文件頁(yè)數(shù)： | 7/30頁(yè) |
| 文件大?。?/td> | 165K |
| 代理商： | DS2432P |
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PRELIMINARY
DS2432
15 of 30
Compute Next Secret [33h]
Some applications may require a higher level of security than can be achieved by a single, directly written
secret. For additional security the DS2432 can compute a new secret based on the current secret, the
contents of a selected memory page, and a partial secret that consists of all data in the scratchpad. To
install a computed secret the master issues the Compute Next Secret command, which activates the
512-bit SHA-1 engine, provided that the secret is not write-protected. Table 1 shows how the various data
components involved enter the SHA engine and how a portion of the SHA result is loaded into the
secret's memory location. The SHA computation algorithm itself is explained later in this document. The
Compute Next Secret command can be applied as often as desired to increase the level of security. The
bus master does not need to know the device’s current secret in order to successfully compute a new one
and then overwrite the existing secret.
SHA-1 Input Data for Compute Next Secret Command Table 1
M0[31:24] = (SS+0)
M0[23:16] = (SS+1)
M0[15:8] = (SS+2)
M0[7:0] = (SS+3)
M1[31:24] = (PP+0)
M1[23:16] = (PP+1)
M1[15:8] = (PP+2)
M1[7:0] = (PP+3)
M2[31:24] = (PP+4)
M2[23:16] = (PP+5)
M2[15:8] = (PP+6)
M2[7:0] = (PP+7)
M3[31:24] = (PP+8)
M3[23:16] = (PP+9)
M3[15:8] = (PP+10)
M3[7:0] = (PP+11)
M4[31:24] = (PP+12)
M4[23:16] = (PP+13)
M4[15:8] = (PP+14)
M4[7:0] = (PP+15)
M5[31:24] = (PP+16)
M5[23:16] = (PP+17)
M5[15:8] = (PP+18)
M5[7:0] = (PP+19)
M6[31:24] = (PP+20)
M6[23:16] = (PP+21)
M6[15:8] = (PP+22)
M6[7:0] = (PP+23)
M7[31:24] = (PP+24)
M7[23:16] = (PP+25)
M7[15:8] = (PP+26)
M7[7:0] = (PP+27)
M8[31:24] = (PP+28)
M8[23:16] = (PP+29)
M8[15:8] = (PP+30)
M8[7:0] = (PP+31)
M9[31:24] = FFh
M9[23:16] = FFh
M9[15:8] = FFh
M9[7:0] = FFh
M10[31:24] = MPX
M10[23:16] = (SP+1)
M10[15:8] = (SP+2)
M10[7:0] = (SP+3)
M11[31:24] = (SP+4)
M11[23:16] = (SP+5)
M11[15:8] = (SP+6)
M11[7:0] = (SP+7)
M12[31:24] = (SS+4)
M12[23:16] = (SS+5)
M12[15:8] = (SS+6)
M12[7:0] = (SS+7)
M13[31:24] = FFh
M13[23:16] = FFh
M13[15:8] = FFh
M13[7:0] = 80h
M14[31:24] = 00h
M14[23:16] = 00h
M14[15:8] = 00h
M14[7:0] = 00h
M15[31:24] = 00h
M15[23:16] = 00h
M15[15:8] = 01h
M15[7:0] = B8h
Result of Compute Next Secret
(SS+0) := E[7:0]
(SS+1) := E[15:8]
(SS+2) := E[23:16]
(SS+3) := E[31:24]
(SS+4) := D[7:0]
(SS+5) := D[15:8]
(SS+6) := D[23:16]
(SS+7) := D[31:24]
Legend
Mt
Input buffer of SHA engine
0
≤ t ≤ 15; 32-bit words
SS
Starting address of secret (80h)
PP
Starting address of memory page
See Memory Map, memory pages 0 through 3
(SP+n)
Byte n of scratchpad
MPX
MPX[7] = 0; MPX[6] = 0; MPX[5:0] = (SP+0)[5:0]
D, E
32-bit words, portions of the 160-bit SHA result
After issuing the Compute Next Secret command the master must provide a 2-byte target address to select
the memory page that contributes 256 bits of the SHA input data. The lower five bits of the target address
TA1 are not relevant. If the target address is valid, i. e. is in the range of 0000h to 007Fh, and the secret is
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS2433 | 512 X 8 1-WIRE SERIAL EEPROM, PBCY3 |
| DS2433X | 4K X 1 1-WIRE SERIAL EEPROM, UUC2 |
| DS2433S | 512 X 8 1-WIRE SERIAL EEPROM, PDSO8 |
| DS2434S | SPECIALTY MEMORY CIRCUIT, PDSO16 |
| DS2434 | SPECIALTY MEMORY CIRCUIT, PBCY3 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2432P R | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:1Kb Protected 1-Wire EEPROM with SHA-1 Engine |
| DS2432P T | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:1Kb Protected 1-Wire EEPROM with SHA-1 Engine |
| DS2432P/T&R | 功能描述:電可擦除可編程只讀存儲(chǔ)器 RoHS:否 制造商:Atmel 存儲(chǔ)容量:2 Kbit 組織:256 B x 8 數(shù)據(jù)保留:100 yr 最大時(shí)鐘頻率:1000 KHz 最大工作電流:6 uA 工作電源電壓:1.7 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 |
| DS2432P+ | 制造商:Maxim Integrated Products 功能描述:EEPROM SERL-1WIRE 1KBIT 4PAGES X 256 3.3V/5V 6PIN TSOC - Rail/Tube 制造商:Maxim Integrated Products 功能描述:1-WIRE 1KB EE W/SHA-1 TSOC PBFREE 制造商:Maxim Integrated Products 功能描述:EEPROM 1KB 1-WIRE 6TSOC 制造商:Maxim Integrated Products 功能描述:EEPROM, 1KB, 1-WIRE, 6TSOC 制造商:Maxim Integrated Products 功能描述:OPTOCOUPLERS; Memory Size:1Kbit; Memory Configuration:256 x 4; Supply Voltage Min:2.8V; Supply Voltage Max:5.25V; Memory Case Style:TSOC; No. of Pins:6; IC Interface Type:Serial; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
| DS2432P+R | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:1Kb Protected 1-Wire EEPROM with SHA-1 Engine |
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