ZPSD211R-B-15J STMICROELECTRONICS [STMicroelectronics], ZPSD211R-B-15J Datasheet - Page 19

• Manufacturer Part Number: ZPSD211R-B-15J
• Description: Low Cost Field Programmable Microcontroller Peripherals
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

11.0
PSD Memory
12.0
Control Signals
16
PSD211R Family
The following sections explain the EPROM memory block and how to program and erase
the PSD211R.
11.1 EPROM
For all PSD211R devices, the EPROM is built using Zero-power technology. This means
that the EPROM powers up only when the address changes. It consumes power for the
necessary time to latch data on its outputs. After this, it powers down and remains in
standby mode until the next address change. This happens automatically, and the designer
has to do nothing special.
The 32K x 8 EPROM is divided into eight equal-sized banks. Each bank can be placed in
any address location by programming the PAD. Bank0-Bank7 are selected by PAD A
outputs ES0-ES7, respectively. There is one product term for each bank select (ESi).
11.2 Programming and Erasure
Programming the device can be done using the following methods:
Information for programming the device is available directly from WSI. Please contact your
local sales representative. Also, check our web site (waferscale.com) for information related
to 3rd party programmers.
Upon delivery from WSI, or after each erasure (using windowed part), the PSD211R device
has all bits in the PAD and EPROM in the HI state (logic 1). The configuration bits are in the
LO state (logic 0).
To clear all locations of their programmed contents (assuming you have a windowed
version), expose the windowed device to an Ultra-Violet (UV) light source. A dosage of
30 W second/cm
(V suffix) devices. This dosage can be obtained with exposure to a wavelength of
2537 Å and intensity of 12000 µW/cm
minutes for the low-voltage (V suffix) devices. The device should be approximately 1 inch
(2.54 cm) from the source, and all filters should be removed from the UV light source prior
to erasure.
The PSD211R devices will erase with light sources having wavelengths shorter than
4000 Å. However, the erasure times will be much longer than when using the
recommended 2537 Å wavelength. Note: exposure to sunlight will eventually erase the
device. If used in such an environment, the package window should be covered with an
opaque substance.
Consult your MCU data sheet to determine which control signals your MCU generates, and
how they operate. This section is intended to show which control signals should be
connected to what pins on the PSD211R. You will then use PSDsoft to configure the
PSD211R, based on the combination of control signals that your MCU outputs, for example
RD, WR, and PSEN.
The PSD211R is compatible with the following control signals:
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•
•
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ALE or AS (polarity is programmable)
WR or R/W
RD/E
PSEN
A19/CSI
RESET (polarity is programmable except on low voltage versions with the V suffix).
WSI’s main programmer—PSDpro—which is accessible through a parallel port.
WSI’s programmer used specifically with the PSD211R—PEP300.
WSI’s discontinued programmer—Magic Pro.
A 3rd party programmer, such as Data I/O.
2
is required for PSD211R devices, and 40 W second/cm
2
for 40 to 45 minutes for the PSD211R and 55 to 60
2
for low-voltage