Datasheet

Application Information
13−3
SLLS535E − April 2008 TUSB6250
13.4 General ATA/ATAPI Device Application Information
13.4.1 ATA/ATAPI Connector Pin Diagram
Table 13−1 shows all the signals on the standard 40-pin ATA/ATAPI connector defined by the ATA/ATAPI-5
specification.
Table 13−1. ATA/ATAPI Connector Pin Summary
PIN SIGNAL PIN SIGNAL
1 RESET 2 GND
3 D7 4 D8
5 D6 6 D9
7 D5 8 D10
9 D4 10 D11
11 D3 12 D12
13 D2 14 D13
15 D1 16 D14
17 D0 18 D15
19 GND 20 Key
21 DMARQ 22 GND
23 WR 24 GND
25 RD 26 GND
27 IORDY 28 CSEL (see Note)
29 DMACK 30 GND
31 INTRQ 32 IOCS16 (see Note)
33 A1 34 PDIAG (see Note)
35 A0 36 A2
37 CS0 38 CS1
39 DASP (see Note) 40 GND
NOTE: Shaded signals are not implemented in the TUSB6250
hardware.
13.4.2 Special Note About Shaded Signals
13.4.2.1 CSEL (Cable Select), Pin 28 on the ATA/ATAPI Connector
The CSEL signal is not connected to the TUSB6250. On the ATA/ATAPI host connector (the TUSB6250 side),
the CSEL pin should be tied to ground.
According to the ATA/ATAPI-5 specification, Section 5.2.13, the CSEL signal is used by the ATA/ATAPI device
to configure itself as either device 0 or device 1. The ATA/ATAPI device is required to have a 10-kΩ pullup
resistor on the CSEL pin.
The state of the CSEL signal may be sampled at any time by the device. Based on the sampled value it detects,
the device is configured as either device 0 or device 1, following the rules defined by the ATA/ATAPI
specification.
• If CSEL is negated, the device number is 0;
• If CSEL is asserted, the device number is 1.
Regardless of which type of cable is used (40-conductor or 80-conductor), the conductor on device 0 is always
connected to the host connector. Therefore, a GND on this conductor configures device 0 as the master. The
conductor on device 1 is always left open (not connected) to the cable, this allows the 10-kΩ pullup resistor
implemented on each device to configure itself as a slave.
13.4.2.2 IOCS16, Pin 32 on the ATA/ATAPI Connector
The IOCS16 signal is not connected to the TUSB6250. On the ATA/ATAPI host connector (the TUSB6250
side), the IOCS16
pin should be left open.