Compact flash with nios II

kenson

Readme - Compact flash monitor/debug demonstration
GENERAL DESCRIPTION:
1 Z2 ~1 J- n: C9 JThis distribution contains hardware and software examples suitable for
# r, e2 r6 Y0 B3 @! }5 H! ooperation of the the Compact Flash interface (True IDE mode) peripheral
9 Y$ H- A) e/ w0 f. qincluded in the Nios II 5.0 development kit. This peripheral's register
- i7 p4 {3 h4 ]* amap is equivalent to the compact flash interface previously posted to the
www.niosforum.com "Tested IP" area by Microtronix.
HARDWARE EXAMPLE DESIGNS
Included with this distribution are several hardware example designs
0 P7 Y# S' q! F) j5 ]6 d- nillustrating how to connect Compact Flash pins to the I/O exported from
3 d% w+ \' G  x& `- f# Y7 pthe peripheral. The examples supplied are pre-built and tested on the
following development boards:
- Nios Development Board, Cyclone Edition (EP1C20)
- Nios Development Board, Cyclone II Edition (EP2C35)
- Nios Development Board, Stratix Edition (EP1S40)
- Nios Development Board, Stratix II ES Edition (EP2S60ES)

For users of the Nios Development Board, Stratix Edition (EP1S10 or EP1S10ES
Altera devices), it is suggested that you start with the EP1S40 example design
0 k- g) ]( ?. @8 c1 Vand change SOPC Builder board component & Quartus device assignment, and then
re-compile the design. Do not remove I/O assignments; the I/O assignments for
these three development boards are identical.
In addition, the the Quartus project setting (.qsf) files included with each of
3 ?4 g+ B  F9 Y) P& nthe above hardware examples includes pin-assignments for Compact Flash that you
! \8 z- ^. R3 y* ]& {( cmay easily copy to your own custom design that uses Compact Flash.
: o+ s* o. z) {2 mNote: Hardware example designs in Nios II 5.0 included these same pin
assignments in each design.
SOFTWARE EXAMPLES
+ o9 J: S3 O$ k& o, O1 L$ `8 _The software included in this package allows rudimentary IDE access to
Compact Flash, including debug routines, hot-swap capability, and
  F1 ?& l1 R4 r/ i) \% h+ Bthe ability to read/write compact flash in either LBA or CHS addressing
% U. `' @) J* u" _modes. No file system support is provided, though this example would
3 f" l& }6 e) Userve as a fine starting-point for a higher-level file-system interface.
; |9 Y& R# ?( m# F8 X6 R5 q6 N+ u9 P: pAdditional software support for the Compact Flash interface is included
in the eCOS release for Nios II 5.0, and Micrium MicroC/FS file system,
& B( P. `' c' Y  ]  ?both of which have been tested with the Compact Flash interface
% e  w! v) _7 `( y/ Q8 S% F+ Uperipheral. These software interfaces do NOT require the software included
with distribution, but may be used with the hardware example designs
) X6 C5 {& p5 d0 Uincluded with this distribution.
To build the software example design, open the Nios II IDE, create a new Nios
II C/C++ application (it is suggested that you start with a template such as
) {4 g; F6 j: f"Hello World" or "Blank Project"), then, copy the source-files to the newly
created project directory and "refresh" the project contents in the IDE (F5).
Following this, you may build the application. The main() routine is located
in file cf_test.c
2 y1 d( p4 N2 iNote: If you start with hello world, be sure to remove hello_world.c to prevent
: g7 H  f- v# i2 rconflicts during compilation.
REQUIREMENTS:
* [0 G3 i" f0 ^2 R% V( C, n( D3 s7 RThe example software requires an altera_avalon_cf peripheral named "cf"
% F9 H: M+ [, X2 ?( [. R; |! k% Oinstantiated in your SOPC Builder design. In addition, the default LCD
interface that is included in "standard" and "full_featured" Nios II example
designs may not be used, as it shares pins with the compact flash socket.
5 H9 c. f/ Z/ B3 M; r+ B" }  B& IThe hardware example designs included with this distribution conform to the
, z' ~$ U# _3 h6 X' E& U# O+ Oabove requirements.
' ^/ N  F4 h. v, X" P7 }KNOWN ISSUES & WORKAROUNDS:
2 u$ }8 T3 w3 v8 uEvery effort has been made to make both the Compact Flash interface peripheral
, m5 R, Z+ ?: Eand software examples perform without flaws. However, certain known issues
may prevent Compact Flash card access.
: e5 S; N& J6 |" mThe following are relevant excerpts from the Nios II 5.0 errata discussing
4 h* }/ S$ K- ^% ?* NCompact Flash:
- Intermittent failures while accessing Compact Flash card
3 [1 L" I, ~+ Y5 v
    Nios II 5.0 includes a Compact Flash controller peripheral suitable for
6 m  C. T" L/ ?9 W+ B( p4 @    interfacing to Compact Flash cards in True IDE mode on Nios development
! Z2 }# W+ D1 e6 q$ Y    boards. In order for True IDE mode to operate, Compact Flash cards require
    that the "ATASEL_N" input be driven to ground during power-up.
& Z2 m+ O* o$ [: V    The Compact Flash controller peripheral includes a configurable power
    register used to power-cycle Compact Flash cards in Nios II software
! R  d0 Y& @7 j* t) m+ D    through a MOSFET on the Nios development boards. However, in certain
    development boards, power to the Compact Flash card will not be turned
    off completely during this power-cycle operation. Because of this, the
5 e# ~7 R! |. K1 [    "ATASEL_N" pin may not be sampLED during the power-cycle operation after
    FPGA configuration when this pin is driven to ground. Instead, "ATASEL_N"
8 N* b7 H/ a7 j6 m8 e4 I0 c& K( o    may be sampled by the Compact Flash card when power is first applied to
+ C7 a  }, w; o+ H/ \& X2 [* \2 a    the development board, when I/O are not yet driven by the FPGA (before
    FPGA configuration).
    Workaround:  If you encounter errors with Compact Flash when using the
    Nios development boards, please try one of the following workarounds:
9 K1 O8 |$ U  _1 A        * Try a different Compact Flash card -- Certain cards are more
          susceptible to the power-cycling issue than others.
3 a' Z; Z; `. v        * Modify the Nios development board -- This is recommended for
* f9 |  f* V6 z5 Q/ L8 V          users who are familiar and comfortable with board-level
0 N2 A4 `& q! @& R, z; @          modifications. Disconnect pin 9 (ATASEL_N) on the Compact Flash
          socket on your Nios Development Board and tie this pin to ground.
          Note that the Compact Flash socket uses a staggered numbering on
1 P: I8 X5 ?% ^* Z1 o          the pins (starting from pin 1: 1, 26, 2, 27, ...); please refer
5 q9 T! G1 G- W- k& _7 K          to the Compact Flash Association specification for right-angle
, t' w; Z% n" H$ @9 e$ V. ~          surface-mount connectors for exact specifications on this connector.
          Caution: This will permanently enable True-IDE mode operation.
; R7 G  U* Z$ d0 p. U% v8 I - Compact Flash card and LCD screen do not work concurrently
; e1 y& p+ L0 p$ X8 Q, n% D3 @  m    If there is a Compact Flash card inserted in the development board, the
    LCD and other devices connected to the PROTO1 header might not work.
" _0 Y& K" ^* E7 p0 E    Workaround: Remove the Compact Flash card to ensure proper operation of
8 |% o- q0 D( I    the PROTO1 header, or vice versa.


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