Hitachi HDS728080PLAT20 Specifications - Page 40
PDIAG, CSEL Cable Select, IORDY - drivers
UPC - 829686000094
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DASPThis is a time-multiplexed signal which indicates that a drive is active or that device 1 is present. This signal is driven by an Open-Drain driver and internally pulled up to 5 volts through a 10 kW resistor. During a Power-On initialization or after RESET- is negated, DASP- shall be asserted by Device 1 within 400 ms to indicate that device 1 is present. Device 0 shall allow up to 450 ms for device 1 to assert DASP-. If device 1 is not present, device 0 may assert DASP- to drive an LED indicator. The DASP- signal shall be negated following acceptance of the first valid command by device 1. Anytime after negation of DASP-, either drive may assert DASP- to indicate that a drive is active. During Power-On initialization or after RESET- is negated, DASP- shall be asserted by Device 1 within 400 ms to indicate that device 1 is present. Device 0 shall allow up to 450ms for device 1 to assert DASP-. If device 1 is not present, device 0 may assert DASP- to drive a LED indicator. DASP- shall be negated following acceptance of the first valid command by device 1. At anytime after negation of DASP-, either drive may assert DASP- to indicate that a drive is active. PDIAGThis signal shall be asserted by device 1 to indicate to device 0 that it has completed the diagnostics. This line is pulled up to 5 volts in the drive through a 10 kΩ resistor. Following a Power On Reset, software reset, or RESET-, drive 1 shall negate PDIAG- within 1 ms (to indicate to device 0 that it is busy). Drive 1 shall then assert PDIAG- within 30 seconds to indicate that it is no longer busy and is able to provide status. Following the receipt of a valid Execute Drive Diagnostics command, device 1 shall negate PDIAG- within 1 ms to indicate to device 0 that it is busy and has not yet passed its drive diagnostics. If device 1 is present then device 0 shall wait up to 6 seconds from the receipt of a valid Execute Drive Diagnostics command for drive 1 to assert PDIAG-. Device 1 should clear BSY before asserting PDIAG-, as PDIAG- is used to indicate that device 1 has passed its diagnostics and is ready to post status. If device 1 did not assert DASP- during reset initialization, device 0 shall post its own status immediately after it completes diagnostics and clear the device 1 Status register to 00h. Device 0 may be unable to accept commands until it has finished its reset procedure and is ready (DRDY=1). Device 1 shall release PDIAG-/CBLID- no later than after the first command following a power on or hardware reset sequence so that the host may sample PDIAG-/CBLID- in order to detect the presence or absence of an 80conductor cable assembly. CSEL (Cable Select) The drive is configured as either Device 0 or 1 depending upon the value of CSEL. • If CSEL is grounded, the device address is 0 • If CSEL is open, the device address is 1 KEY Pin position 20 has no connection pin. It is recommended to close the respective position of the cable connector in order to avoid incorrect insertion. IORDY This signal is negated to extend the host transfer cycle when a drive is not ready to respond to a data transfer request and may be negated when the host transfer cycle is less than 240 ns for PIO data transfer. This signal is an open-drain output with 24 mA sink capability and an external resistor is needed to pull this line to 5 volts. Deskstar 7K80 Hard Disk Drive Specification 36