Specifications

Chapter 3 Hardware
32 Reference Manual ReadyBoard 800
Compact Flash Socket (J23)
The board contains a compact flash socket, which allows for the insertion of a compact flash card. The
compact flash card acts as a standard IDE Drive and is connected to the Secondary IDE bus. If a
compact flash card is installed, it is the only device using the secondary IDE bus. A Jumper is used to
select the Master/Slave mode. Refer to Table 2-3, Jumper Settings for more information.
CAUTION To prevent system hangs, ensure your compact flash card is compatible
with UDMA 100 IDE hard disk drives. Consult the Hardware Release
notes and your compact flash card vendor for UDMA 100 compatibility.
Table 3-6 provides the signals and descriptions for a standard compact flash socket, 50-pin, 2 rows,
consecutive (1, 26) with 1.27 mm (0.050") pin spacing.
Table 3-6. Compact Flash Interface Pin/Signal Descriptions (J23)
Pin # Signal Description
1 GND Ground
2 SDD3
Secondary Disk Data 3 – These signals (D0-D15) carry the Data, Commands,
and Status between the host and the controller. D0 is the LSB of the even Byte
of the Word. D8 is the LSB of the Odd Byte of the Word. All Task File
operations occur in byte mode on the low order bus D0-D7, while all data
transfers are 16 bit using D0-D15 to provide the disk data signals.
3 SDD4 Secondary Disk Data 4 – Refer to SDD3 on pin-2 for more information.
4 SDD5 Secondary Disk Data 5 – Refer to SDD3 on pin-2 for more information.
5 SDD6 Secondary Disk Data 6 – Refer to SDD3 on pin-2 for more information.
6 SDD7 Secondary Disk Data 7 – Refer to SDD3 on pin-2 for more information.
7 SDCS1*
Secondary Chip Select 1 – This signal, along with CE2*, select the card and
indicate to the card when a byte or word operation is being performed. This
signal accesses the even byte or odd byte of the word depending on A0 and
CE2*.
8, 10 NC Not connected
9 GND Ground
11, 12 NC Not connected
13 VCC +5 volts +/-5%
14, 15 NC Not connected
16, 17 NC Not connected
18 SDA2 Secondary Address select 2 – One of three signals (0 – 2) used to select one of
eight registers in the Task File. The host grounds all remaining address lines.
19 SDA1 Secondary Address select 1 – Refer to A2 on pin-18 for more information.
20 SDA0 Secondary Address select 0 – Refer to A2 on pin-18 for more information.
21 SDD0 Secondary Disk Data 0 – Refer to SDD3 on pin-2 for more information.
22 SDD1 Secondary Disk Data 1 – Refer to SDD3 on pin-2 for more information.
23 SDD2 Secondary Disk Data 2 – Refer to SDD3 on pin-2 for more information.
24 NC Not connected (IOCS16*)
25, 26 CFD2, CFD1 Connected through 4.7k ohm resister to ground
27 SDD11 Secondary Disk Data 11 – Refer to SDD3 on pin-2 for more information.