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參數資料
| 型號： | ADSP-21MOD870-000 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 調制器/解調器 |
| 英文描述： | Internet Gateway Processor |
| 中文描述： | 56 kbps DATA, MODEM, PQFP100 |
| 封裝： | METRIC, PLASTIC, TQFP-100 |
| 文件頁數： | 14/32頁 |
| 文件大小： | 231K |
| 代理商： | ADSP-21MOD870-000 |
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ADSP-21mod870
–14–
REV. 0
The EZ-ICE connects to your target system via a ribbon cable
and a 14-pin female plug. The ribbon cable is ten inches long
with one end fixed to the EZ-ICE. The female plug is plugged
onto the 14-pin connector (a pin strip header) on the target
board.
Target Board Connector for EZ-ICE Probe
The EZ-ICE connector (a standard pin strip header) is shown in
Figure 13. You must add this connector to your target board
design if you intend to use the EZ-ICE. Be sure to allow enough
room in your system to fit the EZ-ICE probe onto the 14-pin
connector.
The 14-pin, 2-row pin strip header is keyed at the Pin 7 loca-
tion—you must remove Pin 7 from the header. The pins must be
0.025 inch square and at least 0.20 inch in length. Pin spacing
should be 0.1
×
0.1 inches. The pin strip header must have at
least 0.15 inch clearance on all sides to accept the EZ-ICE probe
plug.
Pin strip headers are available from vendors such as 3M,
McKenzie and Samtec.
Target Memory Interface
For your target system to be compatible with the EZ-ICE emu-
lator, it must comply with the memory interface guidelines listed
below.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
GND
KEY (NO PIN)
RESET
BR
BG
TOP VIEW
EBG
EBR
ELOUT
EE
EINT
ELIN
ECLK
EMS
ERESET
Figure 13. Target Board Connector for EZ-ICE
PM, DM, BM, IOM and CM
Design your Program Memory (PM), Data Memory (DM), Byte
Memory (BM), I/O Memory (IOM), and Composite Memory
(CM) external interfaces to comply with worst case device tim-
ing requirements and switching characteristics as specified in
this data sheet. The performance of the EZ-ICE may approach
published worst case specification for some memory access
timing requirements and switching characteristics.
Note: If your target does not meet the worst case chip specifica-
tion for memory access parameters, you may not be able to
emulate your circuitry at the desired CLKIN frequency. De-
pending on the severity of the specification violation, you may
have trouble manufacturing your system as processor compo-
nents statistically vary in switching characteristic and timing
requirements within published limits.
Restriction: All memory strobe signals on the ADSP-21mod870
(RD
,
WR
,
PMS
,
DMS
,
BMS
,
CMS
and
IOMS
) used in your
target system must have 10 k
pull-up resistors connected when
the EZ-ICE is being used. The pull-up resistors are necessary
because there are no internal pull-ups to guarantee their state
during prolonged three-state conditions resulting from typical
EZ-ICE debugging sessions. These resistors may be removed at
your option when the EZ-ICE is not being used.
Target System Interface Signals
When the EZ-ICE board is installed, the performance on some
system signals changes. Design your system to be compatible
with the following system interface signal changes introduced by
the EZ-ICE board:
EZ-ICE emulation introduces an 8 ns propagation delay
between your target circuitry and the processor on the
RESET
signal.
EZ-ICE emulation introduces an 8 ns propagation delay
between your target circuitry and the processor on the
BR
signal.
EZ-ICE emulation ignores
RESET
and
BR
when single-
stepping.
EZ-ICE emulation ignores
RESET
and
BR
when in Emulator
Space (processor halted).
EZ-ICE emulation ignores the state of target
BR
in certain
modes. As a result, the target system may take control of the
processor’s external memory bus only if bus grant (
BG
) is
asserted by the EZ-ICE board’s processor.
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