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EZ80F917150MODG

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
PS030603-1013 13
eZ80Acclaim!
™
/eZ80AcclaimPlus!
™
Ethernet Modules
Product Specification
eZ80F91 MCU (i.e, a generic feature of the eZ80
®
family when it is used in NATIVE
Mode).
When developing with the eZ80 family of products in NATIVE Mode, the challenge with
bus contention occurs when two or more devices drive a common bus. The eZ80F91
MCU’s CS0 drives the Flash CE. After accessing the Flash memory space, CS0 is driven
High a maximum of 8.8 ns after the next rising edge of the clock (refer to T6 in Figure 4).
The Flash turn-off time (T
OD
) is 25 ns, which is the period from OE or CE going High to
the Flash output drivers going into High-Z Mode. In essence, after the end of the MCU’s
read access to Flash, a period of 8.8 ns + 25 ns = 33.8 ns must occur before Flash memory
stops driving the data bus. At this point, the eZ80F91 device is already well into the next
bus cycle.
During a memory write cycle, data (output) from the eZ80F91 device is valid not later
than T3 = 7.5 ns, and the write pulse is asserted not later than 4.5 ns after the falling edge
of the Clock (14.5 ns from the rising edge if Clock is 50 MHz). The result is that during
T
CON
= (33.8 ns – 7.5 ns) = 26.3 ns, two devices drive the common data bus: the eZ80F91
MCU itself, and Flash memory. In turn, data that is being written during the write opera-
Figure 4. Bus Contention without the eZ80Acclaim!
™
/eZ80AcclaimPlus!
™
Ethernet Module:
Fast Buffer Feature
Clock
-CS0
F91 Data
Bus
-RD
Data IN Data OUT
-WR
-CS1
FLash
Data Bus
Bus contention
T6
Tod
T3
T4
PS030603-1013 14
eZ80Acclaim!
™
/eZ80AcclaimPlus!
™
Ethernet Modules
Product Specification
tion could become corrupted. The part used to isolate a slow Flash data bus from a fast
eZ80F91 bus has a 5.5 ns turn-off time, which reduces the 25 ns duration of the T
CON
to
5.5 ns. As a result, bus contention still occurs, but its duration is not 26.3 ns, as described in
the following equation:
Time of contention = (8.8 ns – 7.5 ns + 5.5 ns = 6.8 ns
Data being written is not corrupted because the write pulse is not yet asserted.
For more information about bus contention on the eZ80Acclaim!
™
MCU, refer to the eZ80F91
MCU Product Specification (PS0192). To learn more about bus contention on the
eZ80Acclaim
Plus!
™
MCU, refer to the eZ80F91 ASSP Product Specification (PS0270).
Memory
The Module’s onboard memory consists of the following components:
•
U4, CY7C1049: 512 KB SRAM with a 10 ns access time
•
U5, S29GL064N: 8 MB NOR Flash with 90 ns access time
•
U3, S25FL032: 32 Mb NAND Flash with an SPI interface
The Module contains external Flash memory, and the eZ80F91 MCU contains internal Flash
memory. To allow read/write access to Flash memory on the Module, there are two signals
provided, on connectors J1 and J2. A jumper on the module, JP3, enables the programming of
on-chip Flash. There is also a signal that duplicates the function of this JP3 jumper. Table 3
indicates the states of the signals and the status of the JP3 jumper for different modes.
The external Flash memory space of the eZ80Acclaim!
™
/eZ80AcclaimPlus!
™
Ethernet
Module has an access time of 90 ns. At least five wait states must be added to the cycle
when accessing external Flash at 50 MHz clock speed. The eZ80F91 devices on-chip Flash
Table 3. Flash Memory Programming Signals and Jumpers
Signal/Jumper Function State/Status
DIS_FLASH Controls read/write access to the eZ80Acclaim!
™
/
eZ80AcclaimPlus!
™
Ethernet Module for external Flash memory.
When Low,
access is enabled
FLASHWE
Controls write operations to the boot block of the eZ80Acclaim!
™
/
eZ80AcclaimPlus!
™
Ethernet Module for external Flash memory.
When Low, write
is enabled
JP3 Controls write access to eZ80F91 MCU on-chip Flash memory. When IN, write is
enabled
F91_WE Controls write access to eZ80F91 MCU on-chip Flash memory. When Low, write
is enabled
PS030603-1013 15
eZ80Acclaim!
™
/eZ80AcclaimPlus!
™
Ethernet Modules
Product Specification
is faster; its minimum access time is 60 ns, which requires only three wait states at
50 MHz.
The Modules feature 512 KB of fast SRAM. Access time is 10 ns, which requires one-
wait-state access. The eZ80F91 MCU’s on-chip SRAM is used with zero wait states. An
additional memory component on the Module is NAND Flash memory with an SPI inter-
face. This 32 Mb device is manufactured by Spansion.
Serial Interface Ports
The CPU contains two UARTs with programmable baud rate generators. UART0 is con-
nected to GPIO PD[0:7] on the I/O connector. UART1 is connected to GPIO PC[0:7] on
the I/O connector.
Do not connect an RS-232 interface without level shifters. There are no RS-232 level
shifters on the eZ80Acclaim!
™
/eZ80AcclaimPlus!
™
Ethernet Module.
Physical Dimensions
The footprint of each Modules’ PCB is 63.5 mm x 78.7 mm. With an RJ-45 Ethernet con-
nector, the overall height is 25 mm, see Figure 5.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

EZ80F917150MODG

Mfr. #:
Buy EZ80F917150MODG
Manufacturer:
ZiLOG
Description:
Ethernet Modules eZ80Acclaim Ethernet Module
Lifecycle:
New from this manufacturer.
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