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HY29F400ABT-55I Datasheet(PDF) 10 Page - Hynix Semiconductor |
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HY29F400ABT-55I Datasheet(HTML) 10 Page - Hynix Semiconductor |
10 / 40 page 10 Rev. 1.0/Jan. 02 HY29F400A d n a m m o C e c n e u q e S s e l c y C s u B f o r e b m u N k c o l n U d n a m m o C a t a D 1 t e s e R / d a e R0 1 1 e t o N 2 t e s e R / d a e R2 1 1 e t o N m a r g o r P e t y B2 1 1 e s a r E p i h C4 1 1 e s a r E r o t c e S4 1 ) 2 e t o N ( 1 d n e p s u S e s a r E0 1 0 e m u s e R e s a r E0 1 0 D I c i n o r t c e l E2 1 3 e t o N Notes: 1. Any number of Flash array read cycles are permitted. 2. Additional data cycles may follow. See text. 3. Any number of Electronic ID read cycles are permitted. DEVICE COMMANDS Device operations are initiated by writing desig- nated address and data command sequences into the device. A command sequence is composed of one, two or three of the following sub-segments: an unlock cycle, a command cycle and a data cycle. Table 4 summarizes the composition of the valid command sequences implemented in the HY29F400A, and these sequences are fully de- scribed in Table 5 and in the sections that follow. Writing incorrect address and data values or writ- ing them in the improper sequence resets the HY29F400A to the Read mode. Read/Reset 1, 2 Commands The HY29F400A automatically enters the Read mode after device power-up, after the RESET# input is asserted and upon the completion of cer- tain commands. Read/Reset commands are not required to retrieve data in these cases. A Read/Reset command must be issued in order to read array data in the following cases: If the device is in the Electronic ID mode, a Read/Reset command must be written to re- turn to the Read mode. If the device was in the Erase Suspend mode when the device entered the Electronic ID mode, writing the Read/Re- set command returns the device to the Erase Suspend mode. A read cycle at address 0xXXX00 retrieves the manufacturer code (Hynix = 0xAD). A read cycle at address 0xXXX01 returns the device code: - HY29F400AT = 0x23 in Byte mode, 0x2223 in Word mode. - HY29F400AB = 0xAB in Byte mode, 0x22AB in Word mode. A read cycle containing a sector address (Table 1) in A[17:12] and the address 0x02 in A[7:0] returns 0x01 if that sector is protected, or 0x00 if it is unprotected. Table 4. Composition of Command Sequences Note: When in the Electronic ID bus operation mode, the device returns to the Read mode when V ID is removed from the A[9] pin. The Read/Reset command is not re- quired in this case. If DQ[5] (Exceeded Time Limit) goes High dur- ing a program or erase operation, writing the Read/Reset command returns the sectors to the Read mode (or to the Erase Suspend mode if the device was in Erase Suspend). The Read/Reset command may also be used to abort certain command sequences: Electronic ID Mode Operation The Electronic ID mode provides manufacturer and device identification and sector protection verifi- cation through identifier codes output on DQ[7:0] or DQ[15:0]. This mode is intended primarily for programming equipment to automatically match a device to be programmed with its corresponding programming algorithm. The Electronic ID infor- mation can also be obtained by the host through a command sequence, as described in the Device Commands section. Operation in the Electronic ID mode requires V ID on address pin A[9], with additional requirements for obtaining specific data items as listed in Table 2: |
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