EZ80L925048MOD Datasheet, PDF (21/38 Pages) Zilog, Inc. – eZ80L92 Module is a compact, high-performance Ethernet module

eZ80L925048MOD
eZ80L92 Module Product Specification
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Static RAM
The eZ80L92 Module features 512 KB of fast SRAM. Access speed is typically
12 ns or faster, allowing zero-wait-state operation at 48 MHz. With the CPU at
48 MHz, onboard SRAM can be accessed with zero wait states in eZ80 mode.
CS1_CTL (chip select CS1) can be set to 08h (no wait states).
Flash Memory
The Flash Boot Loader, application code, and user configuration data are held
permanently in NOR Flash memory. A typical application requires eight times
more ROM for code than RAM. As an example, for 128 KB onboard SRAM, 1 MB
of ROM is required. The eZ80L92 Module allows NOR Flash memories between
4 megabits (512 KB) and 32 megabits (4 MB) to be used. The chips are housed in
wide TSOP40 cases. Flash ROM access times are 55–150 ns; typically 90 ns.
NOR Flash should be operated in Intel bus mode to satisfy setup and hold times
and to prevent bus contention with a Write cycle that could possibly follow. For
proper CPU operation at 48 MHz, first set the bus mode control register
CS0_BMC (I/O address 0xF0h) to 82h, then set the Chip Select Control register
CS0_CTL (I/O address 0xAAh) to 08h. These settings select Intel Bus Mode with
two system clocks per bus cycle and zero wait states.
IrDA Transceiver
An onboard IrDA transceiver (ZiLOG ZHX1810) is connected to PD0 (TX), PD1
(RX), and PD2 (Shutdown, R_SD). The IrDA transceiver is of the LED type
870 nm Class 1.
The receiver supply current is 90–150 µA and the transmitter supply current is
260 mA when the LED is active.The IrDA transceiver is accessible via the IrDA
controller attached to UART0 on the eZ80L92 device. The UART0 console and
the IrDA transceiver cannot be used simultaneously.
To use the UART0 for console or to save power, the transceiver can be disabled
by the software or by an off-board signal when using the proper jumper selection.
The transceiver is disabled by setting PD2 (IR_SD) High or by pulling the
DIS_IRDA pin on the I/O connector Low. The shutdown is used for power savings.
To enable the IrDA transceiver, DIS_IRDA is left floating and PD2 is set to Low.
Reset Generator
The onboard Reset Generator Chip performs reliable Power-On Reset. The chip
generates a reset pulse with a duration of 200 ms if the power supply drops below
PS017005-0903
PRELIMINARY
Onboard Component Description