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.
NOTE You may use compact flash cards (Type I or II) from commercial
vendors, but some compact flash cards do not support DMA or UDMA
transfers. Consult the ReadyBoard 800 Hardware Release Notes and your
compact flash card vendor for DMA or UDMA 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 SDCS3*, select the card and
indicate 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 SDCS3*.
8, 10 NC Not connected
9 GND Ground
11, 12 NC Not connected
13 VCC Voltage Pin – This voltage is determined by CF Voltage Select jumper (JP7).
Pins 1-2 = +3.3V or pins 2-3 = +5V.
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*)