AT88SC25616C-MP 查看數據表（PDF） - Atmel Corporation

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AT88SC25616C-MP

CryptoMemory 256 Kbit

Atmel Corporation 

AT88SC25616C

Security Fuses

There are three fuses on the device that must be blown during the device personalization pro-

cess. Each fuse locks certain portions of the configuration memory as OTP memory. Fuses are

designed for the module manufacturer, card manufacturer and card issuer and should be blown

in sequence, although all programming of the device and blowing of the fuses may be performed

at one final step.

Protocol

Selection

Asynchronous

T = 0 Protocol

The AT88SC25616C supports two different communication protocols.

• Smart Card Applications: The asynchronous T = 0 protocol defined by ISO 7816-3 is used

for compatibility with the industry’s standard smart card readers.

• Embedded Applications: A 2-wire serial interface is used for fast and efficient

communication with logic or controllers.

The power-up sequence determines which of the two communication protocols will be used.

This power-up sequence complies with ISO 7816-3 for a cold reset in smart card applications.

• VCC goes high; RST, I/O-SDA and CLK-SCL are low.

• Set I/O-SDA in receive mode.

• Provide a clock signal to CLK-SCL.

• RST goes high after 400 clock cycles.

The device will respond with a 64-bit ATR code, including historical bytes to indicate the memory den-

sity within the CryptoMemory family. Once the asynchronous mode has been selected, it is not

possible to switch to the synchronous mode without powering off the device.

Figure 10. Asynchronous T = 0 Protocol (Gemplus Patent)

Vcc

I/O-SDA

ATR

RST

Synchronous

2-wire Serial

Interface

CLK-SCL

After a successful ATR, the Protocol and Parameter Selection (PPS) protocol, as defined by ISO

7816-3, may be used to negotiate the communications speed with CryptoMemory devices 32 Kbits

and larger. CryptoMemory supports D values of 1, 2, 4, 8, 12, and 16 for an F value of 372. Also

supported are D values of 8 and 16 for F = 512. This allows selection of 8 communications speeds

ranging from 9600 baud to 153,600 baud.

The synchronous mode is the default after powering up VCC due to an internal pull-up on RST.

For embedded applications using CryptoMemory in standard plastic packages, this is the only

communication protocol.

• Power-up VCC, RST goes high also.

• After stable VCC, CLK-SCL and I/O-SDA may be driven.

9

5017HS–SMEM–11/08

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