OXCF950_06 Datasheet, PDF (14/66 Pages) Oxford Semiconductor – low cost asynchronous 16-bit PC card or Compact Flash UART device

OXFORD SEMICONDUCTOR, INC.
OXCF950 rev B DATA SHEET
5.2.2 Normal Mode Space Map
5.3 Access to IO Function
0xFF
Direct
NOT VALID
Common
0x80
0x7F
Additional Storage
Space, which can be
downloaded from the
EEPROM.
0x00
0xFF
0xF8
0xF6
Attribute
(Valid at even
locations only)
Function
Configuration
Registers
Main CIS either:
a) Normal Default
b) Bluetooth Default
c) Custom CIS
(downloaded from
EEPROM)
Indirect
NOT VALID
NOT VALID
0x00
Figure 5: Normal Mode memory space map
5.3.1 Access to Internal UART
0xFF
Access to the internal UART is achieved via standard IO
mapping. As the device is configured as a single function
device, no base address is required to access the UART.
As IO mapping is used, access to the UART is permitted
only after the card has been configured. Once the
Configuration Options Register has been set in the
Attribute area, the UART can be accessed following the
mapping shown in Table 4.
UART Address (hex)
0x00 ₀
1
2
3
0xFF 4
5
6
7
CF/PCMCIA offset from
address 0 for UART
function in IO space (hex)
0
1
2
3
4
5
6
7
Table 4: UART's mapping in I/O space
5.3.2 Access to Local Bus
Access to the internal Local Bus is achieved via standard
IO mapping. The Local Bus function is available in Local
Bus mode only as it’s device pins are used as the extended
address bits required for direct access in Normal mode.
0x00 _{Indirect access is only supported in the PCMCIA}
specification, so the local bus is only available in PCMCIA
systems. As the device is configured as a single function
device, no base address is required to access the Local
Bus. As IO mapping is used, access to the Local Bus is
permitted only after the card has been configured. Once
the Configuration Options Register has been set in the
Attribute area, the Local Bus can be accessed following the
mapping shown in Table 5. This access is permitted only if
bit[0] is reset to ‘0’ in the MDR register in the UART,
otherwise the local configuration registers will be accessed
rather than the local bus.
DS-0027 Feb 06
External—Free Release
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