i L««:a1e • m:QUt /Jl
2.4 NGHIEN ClTU THIET KE VA TICH HOP CHIP XILINX CPLD VAO HE THONG THU NHAN ANH VE TINH KHI TlTONG
VAO HE THONG THU NHAN ANH VE TINH KHI TlTONG
De nang cao chat lugng eiia chip tich hgp chiing toi da tien hanh thu
nghiem tren chip CPLD eiia Xilinx. Ciing tit nhung phan tich mach da thuc hien
tren cac linh kien r5i rac nhu mo ta tren hinh 27 (xem ehi tiet trong eac tai lieu [13] va [15]) chiing toi da thiet ke, che tao modul dien tu thuc hien viec dong bo khung anh ve tinh khi tugng GMS va MT-Sat tren chip XC95108. Phuang phap lap trinh eung la phuang phap do hoa va nhung so lieu ban dau hoan toan giong nhu a ph^n 2.3.2 nhung chip duge chon la XC95108 cua hang Xilinx.
Nhung thong so ky thuat ca ban eiia chip XC95108 eo the torn tat nhu sau:
• Do iri giua eac chan la 7,5 ns
• Tan so lam viec dee 125 ns.
• Co 108 chan vao/ra.
• Dien ap ngu6n nuoi la +5 V
• Dong loi ra eo the chiu duge 24 mA.
Ban mach sau khi che' tao duac minh hoa tren hinh ve.
Hinh 31: Ban mach hoan chinh vdi chip CPLD cua hang Xilinx.
Cac ket qua thir nghiem cho thay bang phuang phap lap trinh CPLD cung nhan duge mot chip tich hgp eo chat lugng hoan toan tuang duang nhu chip FPGA eiia ALTERA nhung the' hien uu diem: Ban mach dan gian ban vi chip khong can boot chuang trinh tu ROM nghia la khi duge cap dien la c6 the hoat dong duge ngay.
Neu duge dung tren thuc te, chae chan nguai dung se lira chon chip duge che tao bang cong nghe CPLD eiia Xilinx. San pham nay duge che tao theo mot
phuang phap khac nhung c6 ciing mot doi tugng ling dung, nen chi mang tinh chat minh chumg cho kha nang viet phan mem va tich hgp len chip ciia nhom tac gia.