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HY29F040AT-12I Datasheet(PDF) 5 Page - Hynix Semiconductor |
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HY29F040AT-12I Datasheet(HTML) 5 Page - Hynix Semiconductor |
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5 / 40 page  5 HY29F040A Read Mode The HY29F040A has three control functions which must be satisfied to obtain data at the outputs. / CE is the power control and should be used for device selection. /OE is the output control and should be used to gate data to the output pins if a device is selected. As shown in Table 1, /WE should be held at V IH, except in Write mode and Enable Sector Protect mode. Address access time (t ACC) is equal to the delay from stable addresses to valid output data. The chip enable access time (t CE) is the delay from stable addresses and stable /CE to valid data at the output pins. The output enable access time is the delay from the falling edge of /OE to valid data at the output pins (assuming the addresses have been stable for at least t ACC-tOE time). Standby Mode The HY29F040A has two standby modes: a CMOS standby mode (/CE input held at Vcc ± 0.5V), when current consumed is typically less than 1 mA; and a TTL standby mode (/CE is held at V IH) when the typical current required is reduced to 1 mA. In standby mode, outputs are in a high impedance state, independent of /OE input. If the device is deselected during programming or erase, the device will draw active current until the programming or erase operation is completed. A18 A17 A16 Address Range SA0 0 0 0 00000H - 0FFFFH SA1 0 0 1 10000H - 1FFFFH SA2 0 1 0 20000H - 2FFFFH SA3 0 1 1 30000H - 3FFFFH SA4 1 0 0 40000H - 4FFFFH SA5 1 0 1 50000H - 5FFFFH SA6 1 1 0 60000H - 6FFFFH SA7 1 1 1 70000H - 7FFFFH Table 3. Sector Addresses Electronic ID Mode The Electronic ID mode allows the reading out of a binary code from the device and will identify its manufacturer and device type. This mode is in- tended for use by programming equipment for the purpose of automatically matching the device to be programmed with its corresponding programming algorithm. This mode is functional over the entire temperature range of the device. To activate this mode, the programming equipment must force V ID (11.5V to 12.5V) on address pin A9. Two identifier bytes may then be sequenced from the device outputs by toggling address A0 from V IL to VIH. All addresses are don’t cares ex- cept A0, A1, A6, and A9. The manufacturer and device codes may also be read via the command register, (i.e., when HY29F040A is erased or programmed in a system without access to high voltage on the A9 pin). The command sequence is illustrated in Table 4 (refer to Electronic ID Command section). Byte 0 (A0=V IL) represents the manufacturer’s code (Hyundai Electronics=ADH) and byte 1 (A0=V IH) the device identifier code (HY29F040A=A4H). These two bytes are given in Table 2. All identifi- ers for manufacturer and devices will exhibit odd parity with the MSB (DQ7) defined as the parity bit. To permit reading of the proper device codes when executing the Electronic ID, A1 must be V IL (see Table 2). |
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